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A hydrocarbon is burnt completely in excess oxygen. it is found that 5.0g of the hydrocarbon gives 14.6g of carbon dioxide and 9.0g of water. knowing that the molecular mass of the hydrocarbon is 30.0 determine the molecular formular of the compound.

Though i have seen the answer but i dont know how to get there. I want the workings, that is how to arrive at the answer

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