Consider the following reaction.

Question

2 CO (g) + O2 (g) −→ 2 CO2 (g)
What is most likely true about the entropy change for this reaction?

Delta Srxn < 0 or Delta Srxn > 0.

Why is it Delta Srxn < 0 ?

Answer 1

You have increased order, making three volumes two. Entropy decreases

Answer 2

On the left you have 3 mols of gas. ON the right you have only 2 mols gas. There is more randomness (more random possibilities) in 3 mols than 2 mols.

Answer 3

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