   Chapter 5, Problem 50PS

Chapter
Section
Textbook Problem

The enthalpy changes of the following reactions can be measured:C2H4(g) + 3 O2(g) → 2 CO2(g) + 2 H2O(ℓ)ΔrH° = –1411.1 kJ/mol-rxnQ2H5OH(ℓ) + 3 O2(g) → 2 CO2(g) + 3 H2O(ℓ)ΔrH° = –1367.5 kJ/mol-rxn(a) Use these values and Hess’s law to determine the enthalpy change for the reactionC2H4(g) + H2O(ℓ) → C2H5OH(ℓ)(b) Draw an energy level diagram that shows the relationship between the energy quantities involved in this problem.

(a)

Interpretation Introduction

Interpretation:

The enthalpy change for the formation of C2H5OH has to be determined.

Concept Introduction:

If a reaction proceeds in two or more other reaction,ΔrH0 for the overall process is the sum of ΔrH0 values of those reactions-Hess’s law.

Explanation

The required equation for the formation of C2H5OH is the reverse of 2rd

Equation i.e,

2CO2+3H2OC2H5OH+3O2

ΔrH20=1367.5kJ/mol

2nd equation should be subtracted from the 1nd equation

The net equation is C2H4+H2OC2H5OH

Therefore,

(b)

Interpretation Introduction

Interpretation:

The enthalpy change for the formation of C2H5OH has to be drawn.

Concept Introduction:

If a reaction proceeds in two or more other reaction,ΔrH0 for the overall process is the sum of ΔrH0 values of those reactions-Hess’s law.

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