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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 18.7, Problem 3RC
Textbook Problem
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The value of Kp for the following reaction at 425 °C is 0.018. What is the value of ΔrG°at this temperature?

2 HI(g)  ⇄ H2(g) + I2(g)

  1. (a) 1.0 × 101 kJ/md-rxn
  2. (b) −14 kJ/mol-rxn
  3. (c) 23 kJ/mol-rxn
  4. (d) 240 kJ/mol-rxn

Interpretation Introduction

Interpretation: the value of ΔrG will be identified by using values of ΔfG in the reaction from the given options.

Concept introduction:

The relation between ΔrG and Kp is,

ΔrG=RTlnKp Ttemperature Runiversalgasconstant

Explanation of Solution

Reason for correct answer:

For the given reaction,

Kp is 0.018 .

T is 425C=(425+273)K=698K

R is 8.3145J/Kmol

The relation between ΔrG and Kp is,

ΔrG=RTlnKp

Therefore,

ΔrG=RTlnKp =(8.3145J/Kmol×698K×ln(0

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Chapter 18 Solutions

Chemistry & Chemical Reactivity
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