   Chapter 17, Problem 101CWP

Chapter
Section
Textbook Problem

# Consider the reaction: PCl 3 ( g ) + Cl 2 ( g ) ⇌ PCl 5 ( g ) At 25°C, ∆H° = −92.50 kJ.Which of the following statements is( are) true?a. This is an endothermic reaction.b. ∆S° for this reaction is negative.c. if the temperature is increased, the ratio PCl 5 PCl 3 will increase.d. ∆G° for this reaction has to be negative at all temperatures.e. When ∆G° for this reaction is negative, then Kp is greater than 1.00.

(a)

Interpretation Introduction

Interpretation: The statements which are true out of the given statements at the given values of temperature and standard enthalpy change for the given reaction are to be determined.

Concept Introduction: The relation between standard free energy change, standard entropy change and standard free energy change is determined by using the formula,

ΔG=ΔHTΔS

To determine: The authenticity of the statement, “The given reaction is an endothermic reaction”.

Explanation

Explanation

Given

The balanced chemical equation for the given reaction is,

PCl3(g)+Cl2(g)PCl5(g)

The te

(b)

Interpretation Introduction

Interpretation: The statements which are true out of the given statements at the given values of temperature and standard enthalpy change for the given reaction are to be determined.

Concept Introduction: The relation between standard free energy change, standard entropy change and standard free energy change is determined by using the formula,

ΔG=ΔHTΔS

To determine: The authenticity of the statement, “The ΔS for the given reaction is negative”.

(c)

Interpretation Introduction

Interpretation: The statements which are true out of the given statements at the given values of temperature and standard enthalpy change for the given reaction are to be determined.

Concept Introduction: The relation between standard free energy change, standard entropy change and standard free energy change is determined by using the formula,

ΔG=ΔHTΔS

To determine: The authenticity of the statement, “If temperature is increased in the given reaction, the ratio PCl5PCl3 will increase”.

(d)

Interpretation Introduction

Interpretation: The statements which are true out of the given statements at the given values of temperature and standard enthalpy change for the given reaction are to be determined.

Concept Introduction: The relation between standard free energy change, standard entropy change and standard free energy change is determined by using the formula,

ΔG=ΔHTΔS

To determine: The authenticity of the statement, “The ΔG for the given reaction is negative at all temperatures”.

(e)

Interpretation Introduction

Interpretation: The statements which are true out of the given statements at the given values of temperature and standard enthalpy change for the given reaction are to be determined.

Concept Introduction: The relation between standard free energy change, standard entropy change and standard free energy change is determined by using the formula,

ΔG=ΔHTΔS

To determine: The authenticity of the statement, “When ΔG for the given reaction is negative, then Kp is greater than 1.00 ”.

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