Week 3 and 4 Assignment, Q 17

[RalphGuevarra]

Hi,

Can someone explain how to the deltaU on this problem? I tried to assume that work was O, but it was wrong. Then I tried to use PV=nRT to find the w and then solve for deltaU with the formula deltaU=q+w, but my answer was still incorrect. Any help would be much appreciated! Here is the question:

[Mathangi Swaminathan 2L]

Hi! I think that you are right to use the deltaU=q+w formula to solve for delta U. You can get w by using this formula w=deltaV*P. To find delta V, you would have to find the final and initial volume, which you can do rearranging PV=nRT to V=nRT/P, and then finding the difference between the final and initial volume. Hope this helps!

[RalphGuevarra]

Hi Mathangi,

Can you please show me how to do it? I feel like I am using the correct formulas to find the deltaU but I am making some mistakes in calculation, and I could not figure out what I did wrong. Thank you!