Chapter 12, Problem 25QAP

Consider the decomposition of ammonium hydrogen sulfide:

${\text{NH}}_4\text{HS}\left(s\right)\rightleftharpoons {\text{NH}}_3\left(g\right)+{\text{H}}_2\text{S}\left(g\right)$

In a sealed flask at 25°C are 10.0 g of NH₄HS, ammonia with a partial pressure of 0.692 atm, and H₂S with a partial pressure of 0.0532 atm. When equilibrium is established, it is found that the partial pressure of ammonia has increased by 12.4%. Calculate K for the decomposition of NH₄HS at 25°C.