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PV Diagrams & Work

PV Diagrams & Work

22. The First Law of Thermodynamics / PV Diagrams & Work / Problem 1

An ideal gas follows the process shown in the PV diagram below. The gas absorbs 960 J of heat to triple its pressure during the process. What is the relationship of internal energy at point X to internal energy at point Y. Explain your reasoning.

ANSWERS OPTIONS

A

U_Y < U_X, Work done decreases internal energy.

B

U_Y = U_X, Heat absorbed is used to do work.

C

U_Y > U_X, Higher pressure means greater internal energy.

D

U_Y - U_X < 960 J; Heat absorbed is shared between work and internal energy.

E

U_Y - U_X = 960 J; ΔU is equal to the heat absorbed by the gas.

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