JEE MAIN - Chemistry (2021 - 25th July Evening Shift - No. 22)
0.8 g of an organic compound was analyzed by Kjeldahl's method for the estimation of nitrogen. If the percentage of nitrogen in the compound was found to be 42%, then ______________ mL of 1 M H2SO4 would have been neutralized by the ammonia evolved during the analysis.
Answer
12
Explanation
Organic compound : 0.8 gm
wt. of N = $$\left( {{{42} \over {100}} \times 0.8} \right)$$ gm
mole of N = $${{{42 \times 0.8} \over {100 \times 14}} = {{2.4} \over {100}}}$$ mol
moles of NH3 = $${{{2.4} \over {100}}}$$
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$${{{1.2} \over {100}}}$$ = 1 $$\times$$ V(l)
$${ \Rightarrow {V_{{H_2}S{O_4}}} = {{1.2} \over {100}}l = 12}$$ ml
wt. of N = $$\left( {{{42} \over {100}} \times 0.8} \right)$$ gm
mole of N = $${{{42 \times 0.8} \over {100 \times 14}} = {{2.4} \over {100}}}$$ mol
moles of NH3 = $${{{2.4} \over {100}}}$$
$${{{1.2} \over {100}}}$$ = 1 $$\times$$ V(l)
$${ \Rightarrow {V_{{H_2}S{O_4}}} = {{1.2} \over {100}}l = 12}$$ ml
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