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Chemistry - General Chemistry - Molecular Formula of a Gas

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A gaseous hydrogen and carbon containing compound is decomposed and found to contain 85.63%C and 14.37%H by mass. The mass of 258 mL of the gas, measured at STP, was found to be 0.646 grams. What is the molecular formula of the compound?

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258 mL of the gas at STP has a mass of 0.646 g

22400 mL of the gas at STP has a mass of 22400 mL * 0.646 g /258 mL = ...

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