2 H2 (g) + O2 (g) →2 H2O (g) In this reaction, the change in entropy will be

Question

Positive, Negative, or Zero?

Answer 1

You are going from 3 moles of gas on the reactant side to 2 moles of gas on the product side. What do you think happens to the entropy? Will there be more or less disorder after the reaction? Two moles of gas should have LESS disorder than 3 moles of gas, right? So, would the entropy decrease, i.e. shouldn't the change be negative?