Homework Answers
Given:
Sof(MX2(s)) = 76.9 J/mol.K
Sof(Y2(g)) = 330.1 J/mol.K
Sof(XY(g)) = 329.7 J/mol.K
Sof(M(s)) = 42.5 J/mol.K
Balanced chemical equation is:
MX2(s) + Y2(g) ---> 2 XY(g) + M(s)
ΔSo rxn = 2*Sof(XY(g)) + 1*Sof(M(s)) - 1*Sof( MX2(s)) - 1*Sof(Y2(g))
ΔSo rxn = 2*(329.7) + 1*(42.5) - 1*(76.9) - 1*(330.1)
ΔSo rxn = 294.9 J/K
Answer: 294.9 J/K
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