Solution: During an adiabatic change of state for an ideal gas 20 J of work are done on the surroundings. During this change, the temperature decreases from 400 K to 380 K. What is ΔU, ΔS and Q for this change of state?
A. ΔU = 20J, ΔS = 0, Q = 0
B. ΔU = -20J, ΔS = 0, Q = 0
C. ΔU = 20J, ΔS = 20/390 J/K, Q = 0
D. ΔU = -20J, ΔS = 20/390 J/K, Q = 0
E. ΔU = 20J, ΔS = 20/390 J/K, Q = 20 J

During an adiabatic change of state for an ideal gas 20 J of work are done on the surroundings. During this change, the temperature decreases from 400 K to 380 K. What is ΔU, ΔS and Q for this change of state?

A. ΔU = 20J, ΔS = 0, Q = 0

B. ΔU = -20J, ΔS = 0, Q = 0

C. ΔU = 20J, ΔS = 20/390 J/K, Q = 0

D. ΔU = -20J, ΔS = 20/390 J/K, Q = 0

E. ΔU = 20J, ΔS = 20/390 J/K, Q = 20 J