We are asked to calculate ΔS°rxn for the combustion of methane to carbon dioxide and liquid water.
CH4 + 2 O2 → CO2(g) + 2 H2O(g)
We can use the following equation to solve for ΔS˚rxn:
Gather from standard tables:
S˚CH4 = 186.27 J/mol • K
S˚O2 = 205.03 J/mol • K
S˚CO2 = 213.67 J/mol • K
S˚H2O = 188.71 J/mol • K
Find ΔS°rxn for the combustion of methane to carbon dioxide and liquid water. Is the sign of ΔS°rxn as expected?
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