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

---

Definitions:

Case-Control Study

A study layout where two sets are identified based on different outcomes and analyzed to discover a causative element.

Confounder

A factor other than the independent variable that may affect the outcome of a study, potentially leading to erroneous conclusions.

Cardiovascular Disease

A class of diseases that involve the heart or blood vessels, including conditions like coronary artery disease, heart failure, and stroke.

Hispanic Ethnicity

Refers to a diverse group of people who trace their origins to Spanish-speaking countries, primarily in Latin America, and share a common cultural heritage, language, and often, a common racial identity.