Question

The number of moles of hygrogen molecules required to produce 20 moles of ammonia through Haber's process is:

• A. 10
• B. 20
• C. 30
• D. 40

Answer 1

The correct option is C 30

According to the Haber's process $N_2$ reacts with $H_2$ as per the equation:
$N_2\text{(}g)$ + $3H_2\text{(}g)$ $\to$ $2N{H}_3\text{(}g)$
From the equation above, we can say that:
2 moles of $N{H}_3$ requires 3 moles of $H_2$.
$\therefore$
Moles of $H_2$ required to form 20 moles of $N{H}_3$ = $\frac{3}{2}\times 20$ = $30\text{mol}$
Hence, the correct answer is option (c).