   # Write a balanced chemical equation for the formation of CH 3 OH( ℓ ) from the elements in their standard states. Find the value for Δ r H ° for CH 3 OH( ℓ ) in Appendix L. ### 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 5, Problem 53PS
Textbook Problem
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## Write a balanced chemical equation for the formation of CH3OH(ℓ) from the elements in their standard states. Find the value for ΔrH° for CH3OH(ℓ) in Appendix L.

Interpretation Introduction

Interpretation:

The enthalpy change for the formation of methanol and the balanced chemical equation 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 of Solution

The unbalanced equation for the reaction is C+H2+O2CH3OH. The equation can be balanced by multiplying the atoms with appropriate number, in the above equation, on the left one carbon atom and two hydrogens and two oxygens and on the right hand side one carbon and four hydrogens and one oxygen atom.

The balanced equation is 2C+4H2+O22CH3OH in the equation, on the left two carbon atoms and six hydrogens and two oxygens and on the right hand side two carbon atoms and eight hydrogens and one oxygen atom.

The change in enthalpy is:

ΔfH0=(1molC1mol-rxn)ΔfH0(C)+(2molH21mol-rxn)ΔfH0(H2)+(1/2molO21mol-rxn)ΔfH0(O2)

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