A sample of a substance containing only C and H burns in excess O2 to...

JAMB 1997

A sample of a substance containing only C and H burns in excess O₂ to yield 4.4g of CO₂
and 2.7 g of H₂O. The empirical formula of a substance is?

(C = 12, O = 16, H = 1)

A. CH₃
B. CH₂
C. CH₄
D. C₂H₂₄

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Correct Answer: Option A

Explanation

C_xH_y + (x + y/4)O₂ = XCO₂ + (y/2)H₂O
4.4 2.7
according to the equation 44x = 9y
Carbon Hydrogen
mole given ratio = (44)/(44), (2.7)/(9) = 0.1,0.3
Empirical formula = (0.1)/(0.1), (0.3)/(o.1) = 1,3 ; CH₃

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