X g of ethanamine was subjected to reaction with followed by hydrolysis to liberate and HCl. The HCl generated was completely neutralised by 0.2 moles of NaOH. X is ______ g.

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Solution

Q.
X g of ethanamine was subjected to reaction with ${NaNO}_{2} / HCl$ followed by hydrolysis to liberate $N_{2}$ and HCl. The HCl generated was completely neutralised by 0.2 moles of NaOH. X is ______ g. [2024]

Ans.
(9)

$HCl + NaOH \to NaCl + H_{2} O$

By stoichiometry

$n_{HCl} = n_{NaOH} = 0.2 mol$

$C_{2} H_{5} {NH}_{2} \overset{{NaNO}_{2} + HCl}{\to}$

$C_{2} H_{5} N_{2}^{+} {Cl}^{-} \overset{H_{2} O}{\to} C_{2} H_{5} OH + N_{2} + HCl$

$n_{C_{2} H_{5} {NH}_{2}} = n_{HCl} = 0.2 mol$

$W_{C_{2} H_{5} {NH}_{2}} (X) = M_{C_{2} H_{5} {NH}_{2}} \times n_{C_{2} H_{5} {NH}_{2}} = 45 \times 0.2 g = 9 g$

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