Under the same temperature and pressure, 10ml of a gaseous hydrocarbon is fully burned in 50ml of oxygen to obtain liquid water and 35ml of mixed gas. What is the molecular formula of the hydrocarbon?

After 10 ml of hydrocarbon is burned, the gas is reduced by 15 ml, that is, 30 ml of gaseous water, so it is 6 h, full combustion, C does not exceed 3, that is, C2H6, or C3H6

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