Question

Calculate the standard entropy change for the following reaction at 25C you will have to look...

Calculate the standard entropy change for the following reaction at 25C you will have to look up the values for entropy change of the reactans and products

2Al(s)+3ZnO(s)->Al2O3(s)+3Zn(s)


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Answer #1

Given reaction is

2Al(s)+3ZnO(s)-->Al2O3(s)+3Zn(s)

ΔS rxn = sum of ΔS (products) - sum of ΔS (reactants)

the standard values of entropy change are

ΔS Al2O3(s) = 50.99 J/K mol

ΔS ZnO = 43.9 J/K mol

ΔS Al = 28.3 J/K mol

ΔS Zn = 41.6 J/K mol

ΔSrxn = [ΔSAl2O3 + 3 X ΔSZn] -[2X ΔSAl + 3 X ΔSZnO]

Putting values

ΔSrxn = [50.99 + 3 X 41.6] -[2 X 28.3 + 3 X 43.9] = 175.79 - 188.3 = -12.51J /K mole

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