Problem: Entropy decreases when NO(g) is oxidized by O2(g) to NO2(g).What major factor leads to a decrease in entropy as the reaction shown takes place?

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We’re being asked to explain what factor leads to the decrease in entropy of the reaction: 


2 NO(g) +   O2(g)   → 2 NO2(g)


Recall that entropy is the degree of chaos or disorder of a system and that it depends on the following:


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Problem Details

A diagram shows a flask of 2 NO (gas) plus O2 (gas) leading to a flask containing 2 NO2 (gas).
Entropy decreases when NO(g) is oxidized by O2(g) to NO2(g).

What major factor leads to a decrease in entropy as the reaction shown takes place?

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