Two gases A and B are separated by a partition. Gas A contracts, having 730j of work done on it. 140j of energy are transferred from B to A. By how much does the internal energy of gas A change?

Answer 1

The total energy transferred to gas A is the sum of the work done on it and the energy transferred from gas B:

Total energy transferred to gas A = Work done on gas A + Energy transferred from gas B
Total energy transferred to gas A = 730 J + 140 J
Total energy transferred to gas A = 870 J

The change in internal energy of gas A is equal to the total energy transferred to it:

Change in internal energy of gas A = Total energy transferred to gas A
Change in internal energy of gas A = 870 J

Therefore, the internal energy of gas A changes by 870 J.