# Homework Help: Work done PV curves

1. Sep 13, 2010

1. The problem statement, all variables and given/known data

One mole of a dilute gas initially has a pressure equal to 1.00 atm, and a volume equal to 14.0 L. As the gas is slowly heated, the plot of its state on a PV diagram moves in a straight line to the final state. The gas now has a pressure equal to 2.00 atm, and a volume equal to 78.0 L.

(a) Find the work done by the gas.

(b) Find the heat absorbed by the gas.

2. Relevant equations

3. The attempt at a solution
I took the area under the PV curve which is a triangle... 64/2*101.325
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Sep 14, 2010

### ehild

Watch out: It is not a triangle. The work done by the gas is the area under the PV curve down to P=0.

ehild

3. Sep 14, 2010

### Andrew Mason

In addition to what ehild points out, watch the units for volume. If you are using MKS units you have to convert litres to _________.

What is the relationship between work done, heat flow and change in internal energy? To find the heat flow, what other quantity do you have to find? (hint: what is the change in temperature?).

AM