Question

$56g$ of nitrogen and $8g$ of hydrogen gas are heated in a closed vessel. At equilibrium $34g$ of ammonia is present. The equilibrium number of moles of nitrogen, hydrogen and ammonia are respectively:

• A. $1,2,2$
• B. $2,2,1$
• C. $1,1,2$
• D. $2,1,2$

Answer 1

The correct option is C $1,1,2$

$N_2$ $+$ $3H_2$ $\to$ $2N{H}_3$

$2$ $4$ $0$

$2-x$ $4-3x$ $2x$

According to the question, $2x=2=>x=1$

Hence at equilibrium,

number of moles of $N_2=2-x=2-1=1$

number of moles of $H_2=4-3x=4-3=1$

number of moles of $N{H}_3=2x=2$