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4 grams of hydrocarbon (Cx Hy) on complete combustion gave 12 grams of CO2. What is the empirical formula of the hydrocarbon? (C = 12, H = 1)

(1) C3H8

(2) CH3

(3) C4H9

(4) CH

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Correct option (1) C3H8


% C % H 

12/44 x 100


= 900/11

= 200/11

 mole ratio = 3 : 8

 empirical formual = C3H8

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