Question

The state of an ideal gas can be represented by a point on a PV (pressure-volume) diagram. If you know the quantity of gas, n, a unique point in pressure (P) and volume (V) can be used to determine a temperature (T). Each point on a PV diagram also has a single internal energy (U) assigned to it. If a process starts at a point and returns to that same point on a PV diagram, it returns to the same P, V, T, and U.

The PV diagram below shows four different states, A, B, C, and D. The lines connecting the states represent processes or transitions. For example, the line connecting states A and B represents an expansion of the gas (transition to larger volume) while the pressure is kept constant. In the case of this diagram, the pressure at states A and B is 6.32×10⁵ Pa. The pressure at states C and D is 2.21×10⁵ Pa. Likewise the volume at states A and D is 1.36×10^-3 m³ and the volume at states B and C is 6.12×10^-3m³.

1)What type of process is the transition from state B to C (transition BC)?

2)What type of process is the transition from state C to D (transition CD)?

3)What is the work done by the gas for the transition BC?

4)What is the work done by the gas for the transition AB?

5)What is the work done by the gas for the transition CD?

6)What is the change in internal energy, ΔU, if you follow the system all the way from A to B to C to D and back to A?

Answer 1

Date Cmstant S 6-1 1.36 tant padcess. isobaric Csmpaesion +3008.32 J HPv1x 196-12) 03 152 ve Sign indicale oa is dano bn the pa) G No change depend upsn o