   # Use values of Δ f G° for solid and gaseous iodine at 25 °C (Appendix L) to calculate the equilibrium vapor pressure of iodine at this temperature. ### Chemistry & Chemical Reactivity

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

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 18, Problem 78SCQ
Textbook Problem
1 views

## Use values of ΔfG° for solid and gaseous iodine at 25 °C (Appendix L) to calculate the equilibrium vapor pressure of iodine at this temperature.

Interpretation Introduction

Interpretation:

The equilibrium vapor pressure of iodine at 25 °C should be calculated using ΔfGo.

Concept introduction:

The Gibbs free energy or the free energy change is a thermodynamic quantity represented by ΔrGo. It can be calculated in a similar manner as entropy and enthalpy. The expression for the free energy change is:

ΔrG°fG°(products)fG°(reactants)

ΔGo is related to the equilibrium constant K by the equation, ΔrGo= - RT lnKp

### Explanation of Solution

The equilibrium vapor pressure of iodine at equilibrium is calculated as follows,

The Appendix L was referred for the values of standard free energy values.

The given reaction is, I2(s)I2(g)

The standard entropy change for I2(s) is zero, thus ΔrGo for the reaction is equal to the ΔfGo of iodine gas.

Thus, the ΔrGo value is 19.327 kJ/mol-rxn.

ΔGo is related to the equilibrium constant K by the equation,

ΔrGo= -RT lnKp

Here, lnKp=pI2(g)pI2(s)

Substituting the respective values,

ΔrGo= - (0.008314 kJ/K×mol)(298 K)ln(pI2(g)pI2(s))

The value of pI2(s) is zero

### 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

Find more solutions based on key concepts
Generally speaking, vegetable and fish oils are rich in saturated fat. T F

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

What is the difference between pyranose and furanose rings?

Chemistry for Today: General, Organic, and Biochemistry

Suppose you pour hot coffee for your guests, and one of them wants it with cream. He wants the coffee to be as ...

Physics for Scientists and Engineers, Technology Update (No access codes included)

Whats the most valuable biological resource?

Oceanography: An Invitation To Marine Science, Loose-leaf Versin 