I need a little starter on this one....can't figure out how to do it(or even start it)....I'll work it, if I can get some help along the way....(adsbygoogle = window.adsbygoogle || []).push({});

Two moles of an ideal gas at 20 deg C undergo a free adiabatic expansion from 2.0 liters to 66 liters. Then the gas is adiabatically compressed such that the pressure is inversely proportional to the square of the volume: P=P(not)(V(not)/V)^2. What is the total internal energy change after both processes if the last compression reduces the volume by a factor of 4.

The problem is kinda hard to understand in itself for me....so any help would be greatly appreciated.

Thanks,

Brad

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Internal energy change

**Physics Forums | Science Articles, Homework Help, Discussion**