Question

The number of moles of hydrogen 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 $30$

Haber's process
$N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2N{H}_3\left(g\right)$
20 moles need to be produced
2 moles of $N{H}_3\to 3\text{moles of}{H}_2$
Hence 20 moles of $N{h}_3\to \frac{3\times 20}{2}=30$ moles of $H_2$