   Chapter 17, Problem 6ALQ ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

#### Solutions

Chapter
Section ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem

# Consider the following statements: “Consider the reaction A ( g ) + B ( g ) ⇌ C ( g ) . for which at equilibrium [ A ] = 2 M , [ B ] = 1 M , and [ C ] = 4 M . To a 1-L container of the system at equilibrium you add 3 moles of B. A possible equilibrium condition is [ A ] = 1 M , [ B ] = 3 M , and [ C ] = 6 M , because in both cases, K = 2 .” Indicate everything you think is correct in these statements, and everything that is incorrect. Correct the incorrect statements, and explain.

Interpretation Introduction

Interpretation:

The correct and incorrect things in the given statements are to be indicated. The incorrect statements are to be corrected and explained.

Concept Introduction:

In a chemical equilibrium the concentration of the reactants and products remain constant. The rate of the forward reaction is equal to the rate of backward reaction.

The equilibrium constant of a reaction is expressed as the ratio of the concentration of the products and reactants, each raised to the power of their stoichiometric coefficients. The general equilibrium reaction is represented as,

aA+bBcC+dD

The equilibrium constant for the above chemical reaction is expressed as,

K=CcDdAaBb.

Explanation

The given reaction is,

A(g)+B(g)C(g)

At equilibrium A=2M, B=1M and C=4M.

The equilibrium constant for the given chemical reaction is expressed as,

K=CAB

Substitute the value of equilibrium concentration in the above equation.

K=CAB= 421=    2

The equilibrium constant for the given chemical reaction is 2.

Hence, the first statement is correct.

It is given that after adding the 3 moles of B, the possible equilibrium condition is A=1M, B=3M and C=6M

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