Please help me solve this physic problem?

Posted on 2015-09-26 08:39:00 in Physics by LOLLY

Ideal gas inside a cylinder that surrounded by insulator around it to prevent lost of heat, the initial volume of the gas is 2.9 x 10^-4 m^3 at initial pressure 1.04 x 10^5 pa and initial temp 314 K.
1. Find mole of gas in the cylinder. ( I solved this so just ignored it. I'm trying to give all the problem so it won't miss anything. Answer : 0.011 mole

2. The gas expanding to final state of volume is 2.9 x 10^-5 m^3 and temp is increased to 790 K. Find final state of pressure. ( also solved this ) Answer : Pf = 2.6 x 10^6 pa.

3.The gas has work done 91J after the expanding. By using First Law of Thermodynamics, find the changes of internal energy after the expanding.

4.Gives definition of Internal Heat by using solution from above system ( solution from third problem ), and explain why the temperature increase when gas expanding.

Thanks you very very much so far i can only solve 1 and 2 and there's 2 more thanks you before hand

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