First of all...thanks for any help. This is ultrabasic introduction to therm, so I know everyone says that no question is stupid, but I just feel like I'm really missing the boat here. 1. The problem statement, all variables and given/known data The temperature of a monatomic ideal gas remains constant during a process in which 4390 J of heat flows out of the gas. How much work (including the proper + or - sign) is done on the gas? 2. Relevant equations [tex]\Delta[/tex]E=nCv[tex]\Delta[/tex]T and I think...maybe [tex]\Delta[/tex]E=Q - W 3. The attempt at a solution Since it says that the temperature remains constant, I was thinking that [tex]\Delta[/tex]E=0 Q is the heat supplied TO the system, so if 4390 J of heat came out, then it would be -Q. So I figured that: [tex]\Delta[/tex]E=Q - W 0=-4390 - W W=-4390 Joules That's not correct. They must be telling me that it's a monatomic ideal gas for some reason. HELP!!