# Homework Help: Entropy problem -- heating 2 moles of an ideal gas...

1. Oct 2, 2015

### zerorin

Moderator's Note: THIS HOMEWORK WAS POSTED IN ANOTHER FORUM, SO THERE IS NO TEMPLATE.

calculate the change in entropy suffered by 2 moles of an ideal gas on being heated from a volume of 100L at 50C to a volume of 150L at 150C. for the gas Cv=7.88 cal/moleC.

I'm really confused in entropy and don't know where to start..

Last edited by a moderator: Oct 2, 2015
2. Oct 2, 2015

### jimmy neutron

The change in entropy for a reversible process is

DS = int (dQrev/T)

You should be able to calculate this if you know the equation of state for a perfect gas

3. Oct 2, 2015

### Staff: Mentor

You have shown no effort to solve this problem. We need to see some effort on your part, even if it is something as little as articulating what entropy is and how it is calculated. How can we help you if we don't know what your sticking point is? Please do not post homework problems with no effort in the future.