For the hypothetical reaction #A_((g)) rarr B_((g)) + C_((g))#, if the volume is held constant, would entropy increase or decrease? Help please!

I know that when more moles of gas are created entropy increases, and when pressure increases entropy decreases. But what happens when the creation of more moles of gas causes the pressure to increase? Thank you for the help!

1 Answer
May 2, 2017

Entropy increases.

#"A(g) → B(g) + C(g)"#

You are creating two moles of gas from 1 mol of gas.

This is the most important factor.

You will have more molecules in the same volume, so the entropy of the system has increased.