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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

The enthalpy changes of the following reactions can be measured:

C2H4(g) + 3 O2(g) → 2 CO2(g) + 2 H2O()

Δr = –1411.1 kJ/mol-rxn

Q2H5OH() + 3 O2(g) → 2 CO2(g) + 3 H2O()

ΔrH° = –1367.5 kJ/mol-rxn

(a) Use these values and Hess’s law to determine the enthalpy change for the reaction

C2H4(g) + H2O() → C2H5OH()

(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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