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Question 9.55 asks you to write a balanced chemical equation for the formation reaction of various gases. In part C, it asks you to do so for CO(g). Why do you use C(s, graphite) for the chemical equation and not C(s, diamond) or C(g)? Is C(s, graphite) the most stable form of carbon?
C(s, graphite) is the most stable element of carbon so that's why you would use C(s, graphite) as opposed to C(s, diamond). This can be confirmed if you look at the appendix of the textbook. The enthalpy of formation of C(s, graphite) is 0, which is what we expect for elements in their most stable form.
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