Thermodynamics Homework Help: Work, Internal Energy & Gas Compression

[rutherfordln]

Homework Statement

A gas is compressed at a constant pressure of 0.800 atn from 12.00 L to 3.00 L. In the process, 420 J of energy leaves the gaas by heat.

a) What is the work done on the gas?

b) what is the change in its internal energy?

Homework Equations

1atm = 1.0135e5 N/m^2
1Pa = 1 N/m^2

The Attempt at a Solution

 

[Hootenanny]

The Attempt at a Solution

...?