   Chapter 15, Problem 51GQ

Chapter
Section
Textbook Problem

Kc for the decomposition of ammonium hydrogen sulfide is 1.8 × 10−4 at 25 °C.NH4HS(s) ⇄ NH3(g) + H2S(g) (a) When the pure salt decomposes in a flask, what are the equilibrium concentrations of NH3 and H2S? (b) If NH4HS is placed in a flask already containing 0.020 mol/L of NH3 and then the system is allowed to come to equilibrium, what are the equilibrium concentrations of NH3 and H2S?

(a)

Interpretation Introduction

Interpretation:

The equilibrium concentration of the products in the decomposition reaction of ammonium hydrogen sulphide has to be given.

Concept Introduction:

Equilibrium constant in terms of pressure[Kp]: Equilibrium constant can be expressed in terms of partial pressures in atmospheres.

aA(g)+bB(g)cC(g)+dD(g)KP=PCc×PDdPAa×PBb

The activity of solid substance will not appear in equilibrium and numerically it is considered as one.

Explanation

Given:

NH4HS(s)NH3(g)+H2S(g)Kc=1.8×10-4

In the given reaction ammonium hydrogen sulphide is in solid state and thus its pressure can be taken as unity. There is no role of ammonium hydrogen sulphide in the equilibrium expression.

For this equation:

NH4HS(s)NH3(g)+H2S(g)

Kc=[NH3]×[

(b)

Interpretation Introduction

Interpretation:

The equilibrium concentrations of NH3andH2S has to be determined.

Concept Introduction:

Equilibrium constant in terms of pressure[Kp]: Equilibrium constant can be expressed in terms of partial pressures in atmospheres.

aA(g)+bB(g)cC(g)+dD(g)KP=PCc×PDdPAa×PBb

The activity of solid substance will not appear in equilibrium and numerically it is considered as one.

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

A salt does not release ________ in water. a. ions b. H+

Biology: The Unity and Diversity of Life (MindTap Course List)

How do eating disorders affect health?

Understanding Nutrition (MindTap Course List)

Write an expanded structural formula for the following: a. b.

Chemistry for Today: General, Organic, and Biochemistry 