Student Doctor Network Forums > Pre-Medical Forums > MCAT Discussions > Kaplan MCAT Forum > I am confused on this question...can anyon help me? PDA View Full Version : I am confused on this question...can anyon help me? sab42104-25-2008, 01:16 PMTWo containers each containing 2 m oles of th same ideal gas at the same pressure and tempreature are kept isolated from one another. Two procedures are performed:300 J of heat enery is added to the gas in container 1 and container two is allowed to expand, the gas inside doing 300 j of work work on the container walls. What is the difference between internal energies of the two samples of gas after these procedures? This question is from Kaplan Q bank and the answer is 600J of work. I dont understand kaplan's explanation for this question. Regards. FiLLiBEANO04-27-2008, 07:53 PMcontainer 1 is not allowed to expand and will not feel any effects when any other energies are added to it. But, container 2 is allowed to expand. since there are 2 moles of the gas, adding 300 J/mol will give you 600 J of work hansen4405-01-2008, 11:58 PMthe wording is a bit confusing, but I think the energy added is 300 J and the other container work is being done so the W=PV volume is getting bigger so the work is positive done by the system. So there is a 600 J difference. nkhan05-12-2008, 11:20 AMW=q-w W=q-PV W=0-300 (Beaker 1) -> -300J W=300-0 (Beaker 2) -> +300J Difference between the two, 300-(-300)=600J difference in energy. hope this helps