College Chemistry Multiple Choice Question Set 4
| 1. How many moles of CO2 are present in 220 mg? | ||
| (a) | 5 moles | |
| (b) | 0.005 mole | |
| (c) | 5000 moles | |
| (d) | 10 moles | |
| 2. What is the percent water in hydrated calcium chloride...CaCl2·2H2O? | ||
| (a) | 66.67% | |
| (b) | 32.47% | |
| (c) | 24.51% | |
| (d) | 12.26% | |
| 3. What is the empirical formula for a compound that contains 17.34% hydrogen and 82.66% carbon? | ||
| (a) | C5H | |
| (b) | C2H5 | |
| (c) | CH3 | |
| (d) | CH2 | |
| 4. What is the molecular formula for a compound that is 46.16% carbon, 5.16% hydrogen and 48.68% fluorine if the molar mass of this compound is 156.12 g? | ||
| (a) | C3H4F2 | |
| (b) | C5H10F5 | |
| (c) | C6H8F4 | |
| (d) | C6H6F3 | |
| 5. If 2.68 g of hydrated sodium sulfate, Na2SO4·nH2O, on heating produces 1.26 g of water, what is the empirical formula of this compound? | ||
| (a) | Na2SO4·H2O | |
| (b) | 2Na2SO4·H2O | |
| (c) | Na2SO4·7H2O | |
| (d) | 9Na2SO4·8H2O | |
| 6. One mole of (NH4)2HPO4 contains _?_ moles of hydrogen atoms. | ||
| (a) | 1 | |
| (b) | 5 | |
| (c) | 6 | |
| (d) | 9 | |
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