What is the empirical formula of the hydrocarbon?
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a) A 13.5 g sample of a hydrocarbon was burnt in excess oxygen. Complete combustion of the hydrocarbon yielded 42.4 g of carbon dioxide and 17.76 g of water. Determine the empirical ...show more
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Answer:
a) moles CO2 = 42.4g x 1mol/44g = 0.96 mol CO2 = 0.96 mol C = ~1mol C moles H2O = 17.76g x 1mol/18g = 0.99 mol H2O = ~2 mol H Empirical formula = CH2 molar mass of 1 empirical form. = 14 13.5g orig. sample/0.241mol = 56g/mol So there are 56/14 = 4 empirical formulae in one molecular form. Molecular formula = C4H8
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