Question

An organic compound of formula $C_3{H}_{7}N$ was analysed for nitrogen by dumas method calculate the volume of $N_2$ gas evolved at NTP from 2g of substance

• A. 405 ml
• B. 342 ml
• C. 392 ml
• D. 100ml

Answer 1

The correct option is C

392 ml

$\%$ of N in $C_3{H}_{7}N=\frac{14}{57}\times 100$

Further, $\%$ of $N=\frac{28}{22400}\times \frac{\text{volume of}{N}_2\text{at NTP}\times 100}{\text{weight of substance}}$

$\Rightarrow \frac{14}{57}\times 100=\frac{1}{8}\times \frac{V}{2}$

$\Rightarrow V\approx 392ml$