Which of the following thermochemical equations can have AHf° for the heat of the reaction?

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Review Problem 6.089
Which of the following thermochemical equations can have AHf° for the heat of the reaction?
a) CO(NH2)2(aq) → CO(NH2)2(s)
b) C + 0 + 2N + 4H → CO(NH2)2(aq)
c) C(s, graphite) + 1/202(g) + N2(g) + 2H2(g) → CO(NH2)2(aq)
O d) 20(s, graphite) + 02(g) + 2N2(g) + 4H2(g) → 2C0(NH2)2(aq)
For those that cannot, why not?
For choice
reactant CO(NH2)2 is not an element.
For choice
O, N, and H are not the standard states for oxygen, nitrogen, and hydrogen gas. The state for C is not given as graphite or as a solid.
For choice
v, the reaction is not balanced.
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Transcribed Image Text:Review Problem 6.089 Which of the following thermochemical equations can have AHf° for the heat of the reaction? a) CO(NH2)2(aq) → CO(NH2)2(s) b) C + 0 + 2N + 4H → CO(NH2)2(aq) c) C(s, graphite) + 1/202(g) + N2(g) + 2H2(g) → CO(NH2)2(aq) O d) 20(s, graphite) + 02(g) + 2N2(g) + 4H2(g) → 2C0(NH2)2(aq) For those that cannot, why not? For choice reactant CO(NH2)2 is not an element. For choice O, N, and H are not the standard states for oxygen, nitrogen, and hydrogen gas. The state for C is not given as graphite or as a solid. For choice v, the reaction is not balanced. Click if you would like to Show Work for this question: Open Show Work
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