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0.39 g of hydrocarbon on combustion produces 1.32 g CO2 and 0.27 g H2​​​​​​O. Calculate the percentage of C and H in the hydrocarbon.

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A hydrocarbon is a compound which consists of carbon and hydrogen only. It undergoes combustion forming carbon dioxide and water as products.

Given mass of hydrocarbon on combustion = 0.39

Given mass of CO2 = 1.32g

Given mass of H2O = 0.27g

Mass of carbon in 0.39g of CO2 = (12/44) x (1.32) =  0.36g CO2

Mass of hydrogen in 0.27 g of H2O= (2/18) x (0.27) = 0.03g H2O

Percentage of C in hydrocarbon = (0.36/0.39) x (100) = 92.30%

Percentage of H in hydrocarbon= (0.03/0.39) x (100) = 7.69%

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