Damon, this is my last question for today for you. Thanks for all your help.

A gas is at an initial pressure of 1.24104 Pa and occupies a volume of 0.28 m3. The (slow) addition of 23,570 cal of heat to the system causes it to expand in an isobaric manner to a volume of 0.47 m3. How much work (in joules) is done by the system?

Okay. So I got 2356J is that right?