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| 1 |
Calculate the mass percent of oxygen in carbon dioxide. |
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36.36% |
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66.67% |
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72.71% |
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None of the previous answers. |
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| 2 |
Calculate the mass percent of carbon in methanol (CH4O). |
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41.39% |
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37.49% |
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25.00% |
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33.33% |
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None of the previous answers. |
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| 3 |
Calculate the mass percent of hydrogen in methanol (CH4O). |
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12.58% |
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15.38% |
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22.22% |
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3.145% |
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None of the previous answers. |
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| 4 |
Calculate the mass percent of carbon in aspirin (C9H8O4). |
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60.00% |
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42.85% |
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57.44% |
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None of the previous answers. |
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| 5 |
Calculate the mass percent of oxygen in aspirin (C9H8O4). |
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19.05% |
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34.04% |
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35.52% |
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None of the previous answers. |
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| 6 |
Calculate the mass percent of calcium in calcium nitrate. |
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39.26% |
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24.42% |
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30.35% |
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15.38% |
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None of the previous answers. |
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| 7 |
Calculate the mass percent of nitrogen in calcium nitrate. |
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17.07% |
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13.71% |
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8.57% |
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None of the previous answers. |
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| 8 |
Calculate the mass percent of oxygen in calcium nitrate. |
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47.02% |
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58.50% |
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63.96% |
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None of the previous answers. |
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| 9 |
Calculate the mass percent of nitrogen in ammonium sulfide. |
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27.95% |
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41.11% |
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36.84% |
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None of the previous answers. |
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| 10 |
What is the mass percent of water in calcium chloride dihydrate? |
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24.51% |
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12.26% |
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32.46% |
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None of the previous answers. |
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| 11 |
Determine the empirical formula of a compound that consists of 79.88% copper and 20.12% oxygen by mass. |
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Cu2O |
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CuO |
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Cu4O |
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Cu2O3 |
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None of the previous answers. |
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| 12 |
Determine the empirical formula of a compound that consists of 68.42% chromium and 31.58% oxygen by mass. |
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CrO2 |
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CrO |
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CuO3 |
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Cr2O3 |
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None of the previous answers. |
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| 13 |
Determine the empirical formula of a compound that consists of 72.36% iron and 27.64% oxygen by mass. |
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FeO2 |
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FeO |
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Fe3O4 |
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Fe2O3 |
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None of the previous answers. |
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| 14 |
Determine the molecular formula of a compound that consists of 92.26% carbon and 7.74% hydrogen by mass and has a molecular mass of about 78 g/mol. |
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C12O |
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CH |
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C6H6 |
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None of the previous answers. |
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| 15 |
Determine the molecular formula of a compound that consists of 30.44% nitrogen and 69.55%
oxygen by mass and has a molecular mass of about 91 g/mol. |
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NO2 |
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NO |
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N2O |
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N2O4 |
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None of the previous answers. |
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| 16 |
Determine the molecular formula of a compound that consists of 9.93% carbon, 58.64% chlorine and 31.43% fluorine by mass and has a molecular mass of about 121 g/mol. |
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CCl2F2 |
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CClF |
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CCl6F3 |
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None of the previous answers. |
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| 17 |
Determine the molecular formula of a compound that consists of 40.00% carbon, 6.71% hydrogen and 53.29% oxygen by mass and has a molecular mass of about 180 g/mol. |
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C2H4O2 |
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C6H12O6 |
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CH2O |
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None of the previous answers. |
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| 18 |
The mass percent of water in a hydrate of manganese(II) chloride is 36.41%. What is the empirical formula of the hydrate? |
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MnCl2.H2O |
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MnCl2.6 H2O |
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MnCl2.4 H2O |
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None of the previous answers. |
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| 19 |
A 2.500 gram sample of a hydrate of calcium sulfate loses 0.523 grams of water when heated. Determine the formula of the hydrate. |
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CaSO4.2 H2O |
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CaSO4.4 H2O |
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CaSO4.H2O |
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None of the previous answers. |
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