Question

Use the standard molar entropies in Appendix B to calculate the standard entropy of reaction for the oxidation of graphite to carbon monooxide:
2C(s)+O2(g)→2CO(g)

Answer 1

ΔS_rxn = ∑[ΔS_f^o(products)] - ∑[ΔS_f^o(reactants)]

ΔS_rxn = ∑[2 x CO] - ∑[(2 x C) + (1 x O₂]

ΔS_rxn = [2 x 197.7] - [(2 x 5.7) + (1 x 205.1)] = 178.9 J/mol.K

The standard entropy of reaction for the oxidation of graphite to carbon monooxide: ΔS_rxn = 178.9 J/mol.K

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