Question

$N{H}_{4}HS\left(s\right)\rightleftharpoons N{H}_3\left(g\right)+H_{2}S\left(g\right),$ If $K_p=64$ $at{m}^2$, equilibrium pressure of the mixture is?

• A. 16 atm
• B. 8 atm
• C. 64 atm
• D. None of the above

Answer 1

The correct option is A 16 atm

$\begin{array}{cccccc}N{H}_{4}HS\left(s\right)& \rightleftharpoons & N{H}_3\left(g\right)& +& H_{2}S\left(g\right)& K_P=64at{m}^2\\ 0& & 0& & 0& \\ a-x& & x& & x& \end{array}$
$\Rightarrow K_P=\left[N{H}_3\right]\left[H_{2}S\right]=x^2$
$x^2=64at{m}^2$
$x=8atm$
total pressure at equilibrium $=8+8=16atm$