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Question

0.45 g of an organic compound containing only C,H and N on combustion gave 1.1 g of CO2 and 0.3 g of H2O. What is the percentage of C,H and N in the organic compound?

A
C=66.6%6, H=7.4% , N=25.93%
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B
C=56.6%6, H=12.4% , N=30.93%
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C
C=76.6%6, H=7.4% , N=15.93%
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D
None of these
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Solution

The correct option is A C=66.6%6, H=7.4% , N=25.93%
% of C=1244×Weight ofCO2×100Weight of compound =12×1.1×10044×0.45=66.66%
% of H=218×Weight ofH2O×100Weight of compound =2×0.3×10018×0.45=7.4%
% of N=[100(66.66+7.4)]=25.93%

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