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- 1. Multiple-choice5 minutes1 pt2.80 g of an organic compound, containing only carbon and hydrogen forms 8.80 g of carbon dioxide and 3.60 g of water when it undergoes complete combustion. Determine its empirical formula.C4HC6H6CHCH2
- 2. Multiple-choice5 minutes1 ptConsider vitamin C, a compound that contains carbon, hydrogen and oxygen only. On combustion of 1.00 g vitamin C, 1.50 g CO2 and 0.408 g H2O are produced. Determine the empirical formula of vitamin C.CO2C3H4O5C3H4O3C4H5O2
- 3. Multiple-choice5 minutes1 ptA hydrocarbon contains 92.24% by mass of carbon and its Mr = 78.1. Determine its molecular formula.CHC6H6CH4C2H10
- 4. Multiple-choice15 minutes1 ptA compound of nitrogen and fluorine contains 42% by mass of nitrogen. If the molar mass of the compound is about 66 g mol-1, determine its molecular formula.NFN2F2NF2N2F
- 5. Multiple-choice5 minutes1 ptThe percentage of carbon, hydrogen and nitrogen in an unknown compound is found to be 23.30%, 4.85% and 40.78% respectively. Calculate the empirical formula of the compound.C3H4N5O2C2H5N3O2CH4N4O3C5H5N4O4
