A sample of \( 0.5 \mathrm{~g} \) of an organic compound was P trea...

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A sample of \( 0.5 \mathrm{~g} \) of an organic compound was
P treated according to Kjeldahl's method. The

W ammonia evolved was absorbed in \( 50 \mathrm{ml} \) of \( 0.5 \mathrm{M} \) \( \mathrm{H}_{2} \mathrm{SO}_{4} \). The remaining acid after neutralisation by ammonia consumed \( 80 \mathrm{ml} \) of \( 0.5 \mathrm{M} \mathrm{NaOH} \). The percentage of nitrogen in the organic compound is:
(1) 14
(2) 28
(3) 42
(4) 56
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