Question

A sample of Hydro carbon gas on complete combustion gives 6.76 grams of carbon dioxide and 1.38
grams of water. Find the molecular mass and molecular formula? if a volume of 10dm of this gas is
found to weight 11.61 grams at S.T.P.
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Answer 1

If you have the mass of the gas, you can divide the mass by the molecular weight of the gas molecules to get the number of moles. Then multiply this by 22.4 Liters / mole to get the volume. For example, if you have 96 g of O2, then you can divide by the molecular weight of O2, which is 32 g/mol, to get 3 moles.

Answer 2

If you have the mass of the gas, you can divide the mass by the molecular weight of the gas molecules to get the number of moles. Then multiply this by 22.4 Liters / mole to get the volume. For example, if you have 96 g of O2, then you can divide by the molecular weight of O2, which is 32 g/mol, to get 3 moles.