1. The problem statement, all variables and given/known data A monoatomic gas follows the process 1--> 2---> 3---> shown in the figure. How much heat is needed for (a) process 1-->2, and b process 2-->3 ? Link: http://www.chegg.com/homework-help/...-heat-needed-1-2-process-2-3-process-q1077907 2. Relevant equations 3. The attempt at a solution Well, Volume changes so work changes. I calculated the work from point 1 to point 2. The change in volume was 200cm^3 which is 0.0002m^3. The pressure in atmospheres is 3, converting that to pascals is 303,975Pa. I multiplied them together to get the area under the graph for work : (303975Pa)(0.0002m^3)= 60.795J So now I have work. But this for some reason is not the answer.The answer is actually 150J, I just dont understand what to d ofrom this point I know that Eth=3/2nRΔT , but i dont have moles so what can I do from this equation? I just dont know where to g ofrom here. Please help! Thanks.