Entropy Change of a Reaction

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Using the following data, calculate the standard entropy change of the reaction shown below.

$2Al_{(s)}+3ZnO_{(s)}\to Al_2O_{3(s)}+Zn_{(s)}$

$S^o(Al_{(s)})=28.3J/mol.K$

$S^o(Zn_{(s)})=41.6J/mol.K$

$S^o(ZnO_{(s)})=43.9J/mol.K$

$S^o(Al_2O_{3(s)})=51.0J/mol.K$

Before we do the calculation, do we think our entropy is going to be positive or negative based on the chemical equation?

Negative!

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