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Question

# Butyric acid is an organic compound containing only C, H and O and is a component of rancid butter. If 0.44 g of butyric acid is burnt in excess oxygen, it yields 0.88 g of CO2 and 0.36 g of water as the only products. The empirical formula of butyric acid is:

A
CHO4
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B
CHO
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C
C2H4O
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D
CH4O
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Solution

## The correct option is C C2H4OButyric acid Δ−→H2O+CO2 Calculation of mass of C 44g of CO2 contains = 12g of C ∴ 0.88g og CO2 contains = 1244×0.88=0.24g of C Calculation of mass of H 18g of H2O contains = 2g of C ∴ 0.36g og H2O contains = 218×0.36=0.04 g of H Calculation of mass of O Mass of butyric acid-(mass of C + mass of H) = 0.44-(0.24+0.04)=0.16g Calculation of empirical formula: ElementMass of elementNo.of molRelative no. of atomsC0.24g0.2412=0.020.020.01=2H0.04g0.041=0.040.040.01=4O0.16g0.1616=0.010.010.01=1 Hence, empirical formula of butyric acid is C2H4O.

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