I have a Pressure vs Volume Graph and A -> B. It's just an isobaric expansion, the work done by the gas is -3600 J. The gas is monatomic ideal (2.0moles). If I used it correctly, PV=nRT, I found the change in temperature to be 216.6K. My question is: How do I find the change in internal energy and heat? I don't have any info about the gas except that it's ideal and 2.0 moles worth.