The Equilibrium Constant (K_c) for the Decomposition of Ammonium Hydrogen $\rightleftharpoons$

question 22

Multiple Choice

The equilibrium constant (K_c) for the decomposition of ammonium hydrogen sulfide, NH₄HS(s) $\rightleftharpoons$ NH₃(g) + H₂S(g) , is 1.8 × 10^-4 at 25 °C. If excess NH₄HS(s) is allowed to equilibrate at 25 °C, what is the equilibrium concentration of NH₃?

• A) 3.2 × 10^-8 M
• B) 9.0 × 10^-5 M
• C) 1.8 × 10^-4 M
• D) 6.7 × 10^-3 M
• E) 1.3 × 10^-2 M

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