15 ml of gaseous hydrocarbon required for complete combustion of 357 ml of air (21% of O_2 by volume) and the gase

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Q 1270667516.     15 ml of gaseous hydrocarbon required for complete combustion of 357 ml of air (21% of O_2 by volume) and the gaseous products occupied 327 ml (all volume being measured at S.T.P.). What is the formula of hydrocarbon ?
A

C_3H_6

B

C_3H_4

C

C_3H_8

D

None of these

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