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Measuring entropy change

What is the entropy change for 4Al + 3O2 --->2Al2O3.

Choices -728, 102, -626, 728.

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Entropy Change is defined as the change in randomness.
Gas is the most random state out of the three states (gas, liquid, solid)

In this case, the reactants and products are consisted of
reactant: 4 solid particles and 3 gas particles
products: 2 solid ...

Solution Summary

This solution answers and explains a multiple choice question on entropy change.