1. What is chemistry?
Study of matter and changes.
2. What is matter?
Anything with mass, volume.
3. What are the states of matter?
Solid, liquid, gas.
4. What is a solid?
Fixed shape and volume.
5. What is a liquid?
Fixed volume, flows.
6. What is a gas?
Expands, no fixed shape.
7. What is a physical property?
Observed without changing composition.
8. What is a chemical property?
Observed during chemical change.
9. What is an example of physical property?
Boiling point.
10. What is an example of chemical property?
Reactivity with acid.
11. What is a pure substance?
Single type of matter.
12. What is a mixture?
Two or more substances.
13. What is a homogeneous mixture?
Uniform composition throughout.
14. What is a heterogeneous mixture?
Non-uniform composition.
15. What is an element?
Cannot be broken down.
16. What is a compound?
Two or more elements chemically bonded.
17. What is an example of an element?
Iron (Fe).
18. What is an example of a compound?
Water (H 2 O).
19. What is a solution?
Homogeneous mixture.
20. What is a suspension?
Heterogeneous, particles settle.
21. What is a colloid?
Heterogeneous, particles scatter light.
22. What is the law of conservation of mass?
Mass is neither created nor destroyed.
23. Who proposed conservation of mass?
Antoine Lavoisier.
24. What is the law of definite proportions?
Compound has fixed element ratio.
25. Who stated definite proportions?
Joseph Proust.
26. What is the law of multiple proportions?
Elements combine in simple ratios.
27. Who proposed multiple proportions?
John Dalton.
28. What is Dalton’s atomic theory?
Atoms are indivisible, combine in ratios.
29. What is an atom?
Smallest unit of element.
30. What is a molecule?
Two or more atoms bonded.
31. What is atomic mass?
Mass of an atom in amu.
32. What is amu?
1/12th mass of C-12.
33. What is molecular mass?
Sum of atomic masses.
34. What is the atomic mass of hydrogen?
1 u.
35. What is the atomic mass of oxygen?
16 u.
36. What is the atomic mass of carbon?
12 u.
37. What is the molecular mass of H 2 O?
18 u.
38. Why is molecular mass calculated?
To know compound’s mass.
39. What is a mole?
Amount with Avogadro’s number particles.
40. What is Avogadro’s number?
6.022 x 10^23.
41. What is molar mass?
Mass of one mole.
42. What is the molar mass of H 2 O?
18 g/mol.
43. What is the molar mass of C O 2?
44 g/mol.
44. What is the mole concept?
Relates mass, moles, particles.
45. How many particles in 1 mole?
6.022 x 10^23 particles.
46. What is the mass of 1 mole of O 2?
32 g.
47. What is the volume of 1 mole gas at STP?
22.4 L.
48. What is STP?
0°C, 1 atm.
49. What is percentage composition?
Mass percent of elements.
50. How to calculate percentage composition?
(Element mass / Molecular mass) x 100.
51. What is the empirical formula?
Simplest ratio of elements.
52. What is the molecular formula?
Actual number of atoms.
53. What is the empirical formula of C 6 H 12 O 6?
C H 2 O.
54. What is stoichiometry?
Study of reaction quantities.
55. What is a limiting reagent?
Reactant consumed first.
56. What is a theoretical yield?
Maximum product possible.
57. What is actual yield?
Product obtained in reaction.
58. What is percent yield?
(Actual / Theoretical) x 100.
59. What is concentration?
Amount of solute in solution.
60. What is molarity?
Moles of solute per liter.
61. What is molality?
Moles of solute per kg solvent.
62. What is mole fraction?
Moles of component / total moles.
63. What is mass percent?
(Mass of solute / Mass of solution) x 100.
64. What is a chemical reaction?
Process forming new substances.
65. What is a reactant?
Starting substance in reaction.
66. What is a product?
Substance formed in reaction.
67. What is a balanced equation?
Equal atoms on both sides.
68. Why balance equations?
Obeys conservation of mass.
69. What is the law of combining volumes?
Gases combine in simple ratios.
70. Who proposed combining volumes?
Joseph Gay-Lussac.
71. What is Gay-Lussac’s law example?
2H 2 + O 2 → 2H 2 O.
72. What is precision?
Consistency of measurements.
73. What is accuracy?
Closeness to true value.
74. What are significant figures?
Digits in a measurement.
75. How many significant figures in 0.0025?
2.
76. How many significant figures in 123.0?
4.
77. What is the rule for zeros in significant figures?
Leading zeros not significant.
78. What is dimensional analysis?
Unit conversion method.
79. What is the SI unit of mass?
Kilogram (kg).
80. What is the SI unit of length?
Meter (m).
81. What is the SI unit of time?
Second (s).
82. What is the SI unit of temperature?
Kelvin (K).
83. What is the SI unit of amount?
Mole (mol).
84. What is a derived unit?
Combination of base units.
85. What is the unit of volume?
Cubic meter (mÂł).
86. What is density?
Mass per unit volume.
87. What is the unit of density?
kg/mÂł.
88. What is temperature conversion formula?
K
89. What is 25°C in Kelvin?
298 K.
90. What is 373 K in °C?
100°C.
91. What is an isotope?
Same protons, different neutrons.
92. What is an example of isotope?
C-12, C-14.
93. What is atomic mass unit based on?
Carbon-12 isotope.
94. What is the mass of 1 mole of N 2?
28 g.
95. What is the molar mass of N a C l?
58.5 g/mol.
96. What is the molar mass of C a C O 3?
100 g/mol.
97. How many moles in 18 g of H 2 O?
1 mole.
98. How many moles in 44 g of C O 2?
99. What is the mass of 2 moles of O 2?
64 g.
100. What is the volume of 1 mole of C O 2 at STP?
101. How many particles in 2 moles of H 2?
1.2044 x 10^24.
102. What is the empirical formula of C 2 H 4?
C H 2.
103. What is the molecular formula of C H 2 O (n
C 6 H 12 O 6.
104. What is the percentage of C in C O 2?
27.27%.
105. What is the percentage of O in C O 2?
72.73%.
106. What is the percentage of H in H 2 O?
11.11%.
107. What is the percentage of O in H 2 O?
88.89%.
108. What is the molarity of 1 mole in 1 L?
1 M.
109. What is the molality of 1 mole in 1 kg?
1 m.
110. What is the mole fraction of solute in 1:1?
0.5.
111. What is the mass percent of 10 g in 100 g?
10%.
112. What is the law of constant composition?
Same as definite proportions.
113. What is a chemical change?
Forms new substances.
114. What is a physical change?
No new substances formed.
115. What is an example of chemical change?
Burning of wood.
116. What is an example of physical change?
Melting of ice.
117. What is a homogeneous substance?
Uniform throughout.
118. What is a heterogeneous substance?
Non-uniform throughout.
119. What is the molar mass of S O 2?
64 g/mol.
120. What is the molar mass of N H 3?
17 g/mol.
121. How many moles in 34 g of N H 3?
2 moles.
122. What is the mass of 3 moles of S O 2?
192 g.
123. What is the volume of 2 moles gas at STP?
44.8 L.
124. How many particles in 0.5 mole of C O 2?
3.011 x 10^23.
125. What is the empirical formula of C 4 H 8?
126. What is the molecular formula of C H 4?
C H 4.
127. What is the percentage of N in N H 3?
82.35%.
128. What is the percentage of H in N H 3?
17.65%.
129. What is the molarity of 2 moles in 1 L?
2 M.
130. What is the molality of 2 moles in 1 kg?
2 m.
131. What is the mass percent of 5 g in 50 g?
132. What is a cation?
Positive ion.
133. What is an anion?
Negative ion.
134. What is an ionic compound?
Made of ions.
135. What is a covalent compound?
Shares electrons.
136. What is the molar mass of C 6 H 12 O 6?
180 g/mol.
137. How many moles in 90 g of C 6 H 12 O 6?
0.5 mole.
138. What is the mass of 0.1 mole of N a C l?
5.85 g.
139. What is the volume of 0.5 mole gas at STP?
11.2 L.
140. What is the percentage of C l in N a C l?
60.66%.
141. What is the percentage of N a in N a C l?
39.34%.
142. What is the empirical formula of C 3 H 6?
143. What is the molecular formula of C 2 H 2?
C 2 H 2.
144. What is the molar mass of H 2 S O 4?
98 g/mol.
145. How many moles in 49 g of H 2 S O 4?
146. What is the mass of 4 moles of H 2?
8 g.
147. What is the volume of 3 moles gas at STP?
67.2 L.
148. What is a mole ratio?
Ratio from balanced equation.
149. What is excess reagent?
Reactant not fully used.
150. What is a balanced reaction example?
151. What is the molar mass of C H 4?
16 g/mol.
152. How many moles in 32 g of C H 4?
153. What is the percentage of C in C H 4?
75%.
154. What is the percentage of H in C H 4?
25%.
155. What is the empirical formula of C 8 H 18?
C 4 H 9.
156. What is the molar mass of K C l?
74.5 g/mol.
157. What is the mass of 2 moles of K C l?
149 g.
158. What is the molarity of 0.5 mole in 500 mL?
159. What is the molality of 1 mole in 500 g?
160. What is the mass percent of 20 g in 200 g?
161. What is the molar mass of C a ( O H ) 2?
74 g/mol.
162. How many moles in 37 g of C a ( O H ) 2?
163. What is the percentage of C a in C a ( O H ) 2?
54.05%.
164. What is the volume of 0.1 mole gas at STP?
2.24 L.
165. What is the empirical formula of C 2 H 6 O?
C H 3 O.
166. What is the molar mass of N a 2 C O 3?
106 g/mol.
167. How many moles in 53 g of N a 2 C O 3?
168. What is the percentage of N a in N a 2 C O 3?
43.40%.
169. What is the mass of 5 moles of N 2?
140 g.
170. What is the molarity of 1 mole in 2 L?
0.5 M.
171. What is the molality of 0.5 mole in 1 kg?
0.5 m.
172. What is the molar mass of M g C l 2?
95 g/mol.
173. How many moles in 47.5 g of M g C l 2?
174. What is the percentage of M g in M g C l 2?
25.53%.
175. What is the volume of 4 moles gas at STP?
89.6 L.
176. What is the empirical formula of C 10 H 20?
177. What is the molar mass of H C l?
36.5 g/mol.
178. How many moles in 73 g of H C l?
179. What is the percentage of H in H C l?
2.74%.
180. What is the mass percent of 15 g in 100 g?
15%.
181. What is the molar mass of C 2 H 5 O H?
46 g/mol.
182. How many moles in 23 g of C 2 H 5 O H?
183. What is the percentage of C in C 2 H 5 O H?
52.17%.
184. What is the molarity of 2 moles in 500 mL?
4 M.
185. What is the molality of 1 mole in 2 kg?
186. What is the molar mass of K 2 C O 3?
138 g/mol.
187. How many moles in 69 g of K 2 C O 3?
188. What is the percentage of K in K 2 C O 3?
56.52%.
189. What is the volume of 0.2 mole gas at STP?
4.48 L.
190. What is the empirical formula of C 4 H 10?
C 2 H 5.
191. What is the molar mass of H N O 3?
63 g/mol.
192. How many moles in 31.5 g of H N O 3?
193. What is the percentage of N in H N O 3?
22.22%.
194. What is the mass of 6 moles of H 2 O?
108 g.
195. What is the molarity of 0.1 mole in 100 mL?
196. What is the molality of 2 moles in 500 g?
4 m.
197. What is the molar mass of N a O H?
40 g/mol.
198. How many moles in 20 g of N a O H?
199. What is the percentage of N a in N a O H?
57.5%.
200. What is the volume of 5 moles gas at STP?
112 L.
201. What is the empirical formula of C 6 H 6?
C H.
202. What is the molar mass of C a C l 2?
111 g/mol.
203. How many moles in 55.5 g of C a C l 2?
204. What is the percentage of C a in C a C l 2?
36.04%.
205. What is the mass percent of 25 g in 200 g?
12.5%.
206. What is the molar mass of C H 3 C O O H?
60 g/mol.
207. How many moles in 30 g of C H 3 C O O H?
208. What is the percentage of C in C H 3 C O O H?
40%.
209. What is the molarity of 3 moles in 1 L?
3 M.
210. What is the molality of 0.1 mole in 100 g?
211. What is the molar mass of K N O 3?
101 g/mol.
212. How many moles in 50.5 g of K N O 3?
213. What is the percentage of K in K N O 3?
38.61%.
214. What is the volume of 0.3 mole gas at STP?
6.72 L.
215. What is the empirical formula of C 12 H 22 O 11?
C 12 H 22 O 11.
216. What is the molar mass of M g S O 4?
120 g/mol.
217. How many moles in 60 g of M g S O 4?
218. What is the percentage of M g in M g S O 4?
20%.
219. What is the mass of 7 moles of C O 2?
308 g.
220. What is the molarity of 0.2 mole in 200 mL?
221. What is the molality of 3 moles in 1 kg?
3 m.
222. What is the molar mass of N a 2 S O 4?
142 g/mol.
223. How many moles in 71 g of N a 2 S O 4?
224. What is the percentage of N a in N a 2 S O 4?
32.39%.
225. What is the volume of 6 moles gas at STP?
134.4 L.
226. What is the empirical formula of C 5 H 10?
227. What is the molar mass of H 3 P O 4?
228. How many moles in 49 g of H 3 P O 4?
229. What is the percentage of P in H 3 P O 4?
31.63%.
230. What is the mass percent of 30 g in 300 g?
231. What is the molar mass of C 3 H 8?
232. How many moles in 22 g of C 3 H 8?
233. What is the percentage of C in C 3 H 8?
81.82%.
234. What is the molarity of 4 moles in 2 L?
235. What is the molality of 0.2 mole in 200 g?
236. What is the molar mass of A l C l 3?
133.5 g/mol.
237. How many moles in 66.75 g of A l C l 3?
238. What is the percentage of A l in A l C l 3?
20.22%.
239. What is the volume of 0.4 mole gas at STP?
8.96 L.
240. What is the empirical formula of C 9 H 20?
C 9 H 20.
241. What is the molar mass of C u S O 4?
159.5 g/mol.
242. How many moles in 79.75 g of C u S O 4?
243. What is the percentage of C u in C u S O 4?
39.81%.
244. What is the mass of 8 moles of N H 3?
136 g.
245. What is the molarity of 0.3 mole in 300 mL?
246. What is the molality of 4 moles in 2 kg?
247. What is the molar mass of K O H?
56 g/mol.
248. How many moles in 28 g of K O H?
249. What is the percentage of K in K O H?
69.64%.
250. What is the volume of 7 moles gas at STP?
156.8 L.
251. What is the empirical formula of C 2 H 4 O 2?
252. What is the molar mass of F e C l 3?
162.5 g/mol.
253. How many moles in 81.25 g of F e C l 3?
254. What is the percentage of F e in F e C l 3?
34.43%.
255. What is the mass percent of 40 g in 400 g?
256. What is the molar mass of C 4 H 10?
58 g/mol.
257. How many moles in 29 g of C 4 H 10?
258. What is the percentage of C in C 4 H 10?
82.76%.
259. What is the molarity of 5 moles in 1 L?
5 M.
260. What is the molality of 0.3 mole in 300 g?
261. What is the molar mass of N a H C O 3?
84 g/mol.
262. How many moles in 42 g of N a H C O 3?
263. What is the percentage of N a in N a H C O 3?
27.38%.
264. What is the volume of 0.5 mole gas at STP?
265. What is the empirical formula of C 6 H 14?
C 3 H 7.
266. What is the molar mass of Z n C l 2?
136 g/mol.
267. How many moles in 68 g of Z n C l 2?
268. What is the percentage of Z n in Z n C l 2?
48.09%.
269. What is the mass of 9 moles of C H 4?
144 g.
270. What is the molarity of 0.4 mole in 400 mL?
271. What is the molality of 5 moles in 1 kg?
5 m.
272. What is the molar mass of B a C l 2?
208 g/mol.
273. How many moles in 104 g of B a C l 2?
274. What is the percentage of B a in B a C l 2?
66.35%.
275. What is the volume of 8 moles gas at STP?
179.2 L.
276. What is the empirical formula of C 7 H 16?
C 7 H 16.
277. What is the molar mass of N a 2 S?
78 g/mol.
278. How many moles in 39 g of N a 2 S?
279. What is the percentage of N a in N a 2 S?
58.97%.
280. What is the mass percent of 50 g in 500 g?
281. What is the molar mass of C 5 H 12?
72 g/mol.
282. How many moles in 36 g of C 5 H 12?
283. What is the percentage of C in C 5 H 12?
83.33%.
284. What is the molarity of 6 moles in 2 L?
285. What is the molality of 0.4 mole in 400 g?
286. What is the molar mass of A g N O 3?
170 g/mol.
287. How many moles in 85 g of A g N O 3?
288. What is the percentage of A g in A g N O 3?
63.53%.
289. What is the volume of 0.6 mole gas at STP?
13.44 L.
290. What is the empirical formula of C 8 H 16?
291. What is the molar mass of M g ( N O 3 ) 2?
148 g/mol.
292. How many moles in 74 g of M g ( N O 3 ) 2?
293. What is the percentage of M g in M g ( N O 3 ) 2?
16.22%.
294. What is the mass of 10 moles of H 2 S O 4?
980 g.
295. What is the molarity of 0.5 mole in 500 mL?
296. What is the molality of 6 moles in 3 kg?
297. What is the molar mass of N a 3 P O 4?
164 g/mol.
298. How many moles in 82 g of N a 3 P O 4?
299. What is the percentage of N a in N a 3 P O 4?
42.07%.
300. What is the volume of 9 moles gas at STP?
201.6 L.
301. What is the empirical formula of C 10 H 22?
C 5 H 11.
302. What is the molar mass of C a S O 4?
303. How many moles in 68 g of C a S O 4?
304. What is the percentage of C a in C a S O 4?
29.41%.
305. What is the mass percent of 60 g in 600 g?
306. What is the molar mass of C 6 H 14?
86 g/mol.
307. How many moles in 43 g of C 6 H 14?
308. What is the percentage of C in C 6 H 14?
83.72%.
309. What is the molarity of 7 moles in 1 L?
7 M.
310. What is the molality of 0.5 mole in 500 g?
311. What is the molar mass of K 2 S O 4?
174 g/mol.
312. How many moles in 87 g of K 2 S O 4?
313. What is the percentage of K in K 2 S O 4?
44.83%.
314. What is the volume of 0.7 mole gas at STP?
15.68 L.
315. What is the empirical formula of C 4 H 8 O 2?
C 2 H 4 O.
316. What is the molar mass of N a 2 H P O 4?
317. How many moles in 71 g of N a 2 H P O 4?
318. What is the percentage of N a in N a 2 H P O 4?
319. What is the mass of 11 moles of C O 2?
484 g.
320. What is the molarity of 0.6 mole in 600 mL?
321. What is the molality of 7 moles in 1 kg?
7 m.
322. What is the molar mass of C u C l 2?
134.5 g/mol.
323. How many moles in 67.25 g of C u C l 2?
324. What is the percentage of C u in C u C l 2?
47.21%.
325. What is the volume of 10 moles gas at STP?
224 L.
326. What is the empirical formula of C 3 H 8 O?
C 3 H 8 O.
327. What is the molar mass of F e S O 4?
152 g/mol.
328. How many moles in 76 g of F e S O 4?
329. What is the percentage of F e in F e S O 4?
36.84%.
330. What is the mass percent of 70 g in 700 g?
331. What is the molar mass of C 7 H 16?
332. How many moles in 50 g of C 7 H 16?
333. What is the percentage of C in C 7 H 16?
84%.
334. What is the molarity of 8 moles in 2 L?
335. What is the molality of 0.6 mole in 600 g?
336. What is the molar mass of N a N O 3?
85 g/mol.
337. How many moles in 42.5 g of N a N O 3?
338. What is the percentage of N a in N a N O 3?
27.06%.
339. What is the volume of 0.8 mole gas at STP?
17.92 L.
340. What is the empirical formula of C 6 H 12?
341. What is the molar mass of M g O?
342. How many moles in 20 g of M g O?
343. What is the percentage of M g in M g O?
60%.
344. What is the mass of 12 moles of N H 3?
204 g.
345. What is the molarity of 0.7 mole in 700 mL?
346. What is the molality of 8 moles in 4 kg?
347. What is the molar mass of C a ( N O 3 ) 2?
348. How many moles in 82 g of C a ( N O 3 ) 2?
349. What is the percentage of C a in C a ( N O 3 ) 2?
24.39%.
350. What is the volume of 11 moles gas at STP?
246.4 L.
351. What is the empirical formula of C 8 H 10?
C 4 H 5.
352. What is the molar mass of K C l O 3?
122.5 g/mol.
353. How many moles in 61.25 g of K C l O 3?
354. What is the percentage of K in K C l O 3?
31.84%.
355. What is the mass percent of 80 g in 800 g?
356. What is the molar mass of C 8 H 18?
114 g/mol.
357. How many moles in 57 g of C 8 H 18?
358. What is the percentage of C in C 8 H 18?
84.21%.
359. What is the molarity of 9 moles in 1 L?
9 M.
360. What is the molality of 0.7 mole in 700 g?
361. What is the molar mass of A l 2 ( S O 4 ) 3?
342 g/mol.
362. How many moles in 171 g of A l 2 ( S O 4 ) 3?
363. What is the percentage of A l in A l 2 ( S O 4 ) 3?
15.79%.
364. What is the volume of 0.9 mole gas at STP?
20.16 L.
365. What is the empirical formula of C 9 H 18?
366. What is the molar mass of N a 2 S O 3?
126 g/mol.
367. How many moles in 63 g of N a 2 S O 3?
368. What is the percentage of N a in N a 2 S O 3?
36.51%.
369. What is the mass of 13 moles of H 2 O?
234 g.
370. What is the molarity of 0.8 mole in 800 mL?
371. What is the molality of 9 moles in 1 kg?
9 m.
372. What is the molar mass of C u ( N O 3 ) 2?
187.5 g/mol.
373. How many moles in 93.75 g of C u ( N O 3 ) 2?
374. What is the percentage of C u in C u ( N O 3 ) 2?
33.87%.
375. What is the volume of 12 moles gas at STP?
268.8 L.
376. What is the empirical formula of C 10 H 14?
C 5 H 7.
377. What is the molar mass of M g 3 ( P O 4 ) 2?
262 g/mol.
378. How many moles in 131 g of M g 3 ( P O 4 ) 2?
379. What is the percentage of M g in M g 3 ( P O 4 ) 2?
27.67%.
380. What is the mass percent of 90 g in 900 g?
381. What is the molar mass of C 9 H 20?
128 g/mol.
382. How many moles in 64 g of C 9 H 20?
383. What is the percentage of C in C 9 H 20?
84.38%.
384. What is the molarity of 10 moles in 2 L?
385. What is the molality of 0.8 mole in 800 g?
386. What is the molar mass of K 3 P O 4?
212 g/mol.
387. How many moles in 106 g of K 3 P O 4?
388. What is the percentage of K in K 3 P O 4?
55.19%.
389. What is the volume of 1 mole gas at STP?
390. What is the empirical formula of C 12 H 26?
C 6 H 13.
391. What is the molar mass of F e 2 O 3?
160 g/mol.
392. How many moles in 80 g of F e 2 O 3?
393. What is the percentage of F e in F e 2 O 3?
70%.
394. What is the mass of 14 moles of C O 2?
616 g.
395. What is the molarity of 0.9 mole in 900 mL?
396. What is the molality of 10 moles in 5 kg?
397. What is the molar mass of N a C l O 3?
106.5 g/mol.
398. How many moles in 53.25 g of N a C l O 3?
399. What is the percentage of N a in N a C l O 3?
21.60%.
400. What is the volume of 13 moles gas at STP?
291.2 L.
401. What is the empirical formula of C 14 H 30?
C 7 H 15.
402. What is the molar mass of C a 3 ( P O 4 ) 2?
310 g/mol.
403. How many moles in 155 g of C a 3 ( P O 4 ) 2?
404. What is the percentage of C a in C a 3 ( P O 4 ) 2?
38.71%.
405. What is the mass percent of 100 g in 1000 g?
406. What is the molar mass of C 10 H 22?
407. How many moles in 71 g of C 10 H 22?
408. What is the percentage of C in C 10 H 22?
84.51%.
409. What is the molarity of 11 moles in 1 L?
11 M.
410. What is the molality of 0.9 mole in 900 g?
411. What is the molar mass of N a 2 C r O 4?
162 g/mol.
412. How many moles in 81 g of N a 2 C r O 4?
413. What is the percentage of N a in N a 2 C r O 4?
28.40%.
414. What is the volume of 1.1 moles gas at STP?
24.64 L.
415. What is the empirical formula of C 16 H 34?
C 8 H 17.
416. What is the molar mass of K M n O 4?
158 g/mol.
417. How many moles in 79 g of K M n O 4?
418. What is the percentage of K in K M n O 4?
24.68%.
419. What is the mass of 15 moles of N H 3?
255 g.
420. What is the molarity of 1 mole in 1000 mL?
421. What is the molality of 11 moles in 1 kg?
11 m.
422. What is the molar mass of C u C O 3?
123.5 g/mol.
423. How many moles in 61.75 g of C u C O 3?
424. What is the percentage of C u in C u C O 3?
51.42%.
425. What is the volume of 14 moles gas at STP?
313.6 L.
426. What is the empirical formula of C 18 H 38?
C 9 H 19.
427. What is the molar mass of N a 2 S 2 O 3?
428. How many moles in 79 g of N a 2 S 2 O 3?
429. What is the percentage of N a in N a 2 S 2 O 3?
29.11%.
430. What is the mass percent of 110 g in 1100 g?
431. What is the molar mass of C 11 H 24?
156 g/mol.
432. How many moles in 78 g of C 11 H 24?
433. What is the percentage of C in C 11 H 24?
84.62%.
434. What is the molarity of 12 moles in 3 L?
435. What is the molality of 1 mole in 1000 g?
436. What is the molar mass of F e ( N O 3 ) 3?
242 g/mol.
437. How many moles in 121 g of F e ( N O 3 ) 3?
438. What is the percentage of F e in F e ( N O 3 ) 3?
23.14%.
439. What is the volume of 1.2 moles gas at STP?
26.88 L.
440. What is the empirical formula of C 20 H 42?
C 10 H 21.
441. What is the molar mass of C a C O 3?
442. How many moles in 50 g of C a C O 3?
443. What is the percentage of C a in C a C O 3?
444. What is the mass of 16 moles of H 2 O?
288 g.
445. What is the molarity of 1.1 moles in 1100 mL?
446. What is the molality of 12 moles in 6 kg?
447. What is the molar mass of N a 2 S O 4?
448. How many moles in 71 g of N a 2 S O 4?
449. What is the percentage of N a in N a 2 S O 4?
450. What is the volume of 15 moles gas at STP?
336 L.
451. What is the empirical formula of C 22 H 46?
C 11 H 23.
452. What is the molar mass of K 2 C r 2 O 7?
294 g/mol.
453. How many moles in 147 g of K 2 C r 2 O 7?
454. What is the percentage of K in K 2 C r 2 O 7?
26.53%.
455. What is the mass percent of 120 g in 1200 g?
456. What is the molar mass of C 12 H 26?
457. How many moles in 85 g of C 12 H 26?
458. What is the percentage of C in C 12 H 26?
84.71%.
459. What is the molarity of 13 moles in 1 L?
13 M.
460. What is the molality of 1.1 moles in 1100 g?
461. What is the molar mass of M g C O 3?
462. How many moles in 42 g of M g C O 3?
463. What is the percentage of M g in M g C O 3?
28.57%.
464. What is the volume of 1.3 moles gas at STP?
29.12 L.
465. What is the empirical formula of C 24 H 50?
C 12 H 25.
466. What is the molar mass of N a H 2 P O 4?
467. How many moles in 60 g of N a H 2 P O 4?
468. What is the percentage of N a in N a H 2 P O 4?
19.17%.
469. What is the mass of 17 moles of C O 2?
748 g.
470. What is the molarity of 1.2 moles in 1200 mL?
471. What is the molality of 13 moles in 1 kg?
13 m.
472. What is the molar mass of C u S O 4?
473. How many moles in 79.75 g of C u S O 4?
474. What is the percentage of C u in C u S O 4?
475. What is the volume of 16 moles gas at STP?
358.4 L.
476. What is the empirical formula of C 26 H 54?
C 13 H 27.
477. What is the molar mass of C a ( H C O 3 ) 2?
478. How many moles in 81 g of C a ( H C O 3 ) 2?
479. What is the percentage of C a in C a ( H C O 3 ) 2?
24.69%.
480. What is the mass percent of 130 g in 1300 g?
481. What is the molar mass of C 13 H 28?
184 g/mol.
482. How many moles in 92 g of C 13 H 28?
483. What is the percentage of C in C 13 H 28?
84.78%.
484. What is the molarity of 14 moles in 2 L?
485. What is the molality of 1.2 moles in 1200 g?
486. What is the molar mass of N a 2 C O 3?
487. How many moles in 53 g of N a 2 C O 3?
488. What is the percentage of N a in N a 2 C O 3?
489. What is the volume of 1.4 moles gas at STP?
31.36 L.
490. What is the empirical formula of C 28 H 58?
C 14 H 29.
491. What is the molar mass of K H C O 3?
492. How many moles in 50 g of K H C O 3?
493. What is the percentage of K in K H C O 3?
39%.
494. What is the mass of 18 moles of N H 3?
306 g.
495. What is the molarity of 1.3 moles in 1300 mL?
496. What is the molality of 14 moles in 7 kg?
497. What is the molar mass of M g ( H C O 3 ) 2?
146 g/mol.
498. How many moles in 73 g of M g ( H C O 3 ) 2?
499. What is the percentage of M g in M g ( H C O 3 ) 2?
16.44%.
500. What is the volume of 17 moles gas at STP?
380.8 L.
501. What is the empirical formula of C 30 H 62?
C 15 H 31.
502. What is the molar mass of N a C 2 H 3 O 2?
82 g/mol.
503. How many moles in 41 g of N a C 2 H 3 O 2?
504. What is the percentage of N a in N a C 2 H 3 O 2?
28.05%.
505. What is the mass percent of 140 g in 1400 g?
506. What is the molar mass of C 14 H 30?
198 g/mol.
507. How many moles in 99 g of C 14 H 30?
508. What is the percentage of C in C 14 H 30?
84.85%.
509. What is the molarity of 15 moles in 1 L?
15 M.
510. What is the molality of 1.3 moles in 1300 g?
511. What is the molar mass of C u 2 S O 4?
223 g/mol.
512. How many moles in 111.5 g of C u 2 S O 4?
513. What is the percentage of C u in C u 2 S O 4?
56.95%.
514. What is the volume of 1.5 moles gas at STP?
33.6 L.
515. What is the empirical formula of C 32 H 66?
C 16 H 33.
516. What is the molar mass of N a H S O 4?
517. How many moles in 60 g of N a H S O 4?
518. What is the percentage of N a in N a H S O 4?
519. What is the mass of 19 moles of C O 2?
836 g.
520. What is the molarity of 1.4 moles in 1400 mL?
521. What is the molality of 15 moles in 1 kg?
15 m.
522. What is the molar mass of C a S O 3?
523. How many moles in 60 g of C a S O 3?
524. What is the percentage of C a in C a S O 3?
33.33%.
525. What is the volume of 18 moles gas at STP?
403.2 L.
526. What is the empirical formula of C 34 H 70?
C 17 H 35.
527. What is the molar mass of K 2 S?
110 g/mol.
528. How many moles in 55 g of K 2 S?
529. What is the percentage of K in K 2 S?
70.91%.
530. What is the mass percent of 150 g in 1500 g?
531. What is the molar mass of C 15 H 32?
532. How many moles in 106 g of C 15 H 32?
533. What is the percentage of C in C 15 H 32?
84.91%.
534. What is the molarity of 16 moles in 4 L?
535. What is the molality of 1.4 moles in 1400 g?
536. What is the molar mass of N a 2 S 2 O 8?
238 g/mol.
537. How many moles in 119 g of N a 2 S 2 O 8?
538. What is the percentage of N a in N a 2 S 2 O 8?
19.33%.
539. What is the volume of 1.6 moles gas at STP?
35.84 L.
540. What is the empirical formula of C 36 H 74?
C 18 H 37.
541. What is the molar mass of M g S O 3?
104 g/mol.
542. How many moles in 52 g of M g S O 3?
543. What is the percentage of M g in M g S O 3?
23.08%.
544. What is the mass of 20 moles of H 2 O?
360 g.
545. What is the molarity of 1.5 moles in 1500 mL?
546. What is the molality of 16 moles in 8 kg?
547. What is the molar mass of C u C l?
99 g/mol.
548. How many moles in 49.5 g of C u C l?
549. What is the percentage of C u in C u C l?
64.14%.
550. What is the volume of 19 moles gas at STP?
425.6 L.
551. What is the empirical formula of C 38 H 78?
C 19 H 39.
552. What is the molar mass of N a C N?
49 g/mol.
553. How many moles in 24.5 g of N a C N?
554. What is the percentage of N a in N a C N?
46.94%.
555. What is the mass percent of 160 g in 1600 g?
556. What is the molar mass of C 16 H 34?
226 g/mol.
557. How many moles in 113 g of C 16 H 34?
558. What is the percentage of C in C 16 H 34?
84.96%.
559. What is the molarity of 17 moles in 1 L?
17 M.
560. What is the molality of 1.5 moles in 1500 g?
561. What is the molar mass of K 2 S O 3?
562. How many moles in 79 g of K 2 S O 3?
563. What is the percentage of K in K 2 S O 3?
49.37%.
564. What is the volume of 1.7 moles gas at STP?
38.08 L.
565. What is the empirical formula of C 40 H 82?
C 20 H 41.
566. What is the molar mass of C a C l 2?
567. How many moles in 55.5 g of C a C l 2?
568. What is the percentage of C a in C a C l 2?
569. What is the mass of 21 moles of C O 2?
924 g.
570. What is the molarity of 1.6 moles in 1600 mL?
571. What is the molality of 17 moles in 1 kg?
17 m.
572. What is the molar mass of N a S C N?
81 g/mol.
573. How many moles in 40.5 g of N a S C N?
574. What is the percentage of N a in N a S C N?
575. What is the volume of 20 moles gas at STP?
448 L.
576. What is the empirical formula of C 42 H 86?
C 21 H 43.
577. What is the molar mass of M g C l 2?
578. How many moles in 47.5 g of M g C l 2?
579. What is the percentage of M g in M g C l 2?
580. What is the mass percent of 170 g in 1700 g?
581. What is the molar mass of C 17 H 36?
240 g/mol.
582. How many moles in 120 g of C 17 H 36?
583. What is the percentage of C in C 17 H 36?
85%.
584. What is the molarity of 18 moles in 2 L?
585. What is the molality of 1.6 moles in 1600 g?
586. What is the molar mass of N a 2 S i O 3?
122 g/mol.
587. How many moles in 61 g of N a 2 S i O 3?
588. What is
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