
To find:
a) Assign oxidation number to carbon and hydrogen in the reactants and products.
b) Find the standard free energy changes in the two reactions and the overall

Answer to Problem 17.85QA
Solution:
a) The oxidation numbers assigned to carbon and hydrogen in the reactants and products are as follows:
b) The standard free energy changes in the two reactions:
Overall
Explanation of Solution
1) Concept:
To assign the oxidation number of carbon and hydrogen in the reactant and product sides, we will use the guidelines of oxidation number in section
We will calculate the oxidation number of
To calculate the standard free energy of reaction, we can use the standard heat of formation of products and reactants. From this, we can calculate the overall
2) Formula:
i)
ii)
3) Given:
i)
ii)
iii)
iv)
v)
The standard free energy of formation values are taken from Appendix 4 of the text.
4) Calculations:
a) We assign the oxidation number to carbon and hydrogen in reaction by using rules for assigning the oxidation numbers to atoms.
The oxidation number of
The oxidation number of
The oxidation numbers to carbon and hydrogen in the reactants and products:
b) We can calculate the standard free energy of the first reaction by using the standard free energy of formation values taken from Appendix 4 of the text and the formula.
Calculate the standard free energy of the second reaction:
Now add the first and second reactions to get the final answer.
Overall
Conclusion:
We assigned oxidation numbers from oxidation number of O and H and calculated the standard free energy from the values of standard free energy of reaction given in the text.
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Chapter 17 Solutions
Chemistry: An Atoms-Focused Approach
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