posted by Tasha .
Three moles of a monatomic ideal gas expand adiabatically, and its temperature decreases from 430 to 160 K.
(a) What is the work done by (or done to) the gas? Include the algebraic sign.
(b) What is the change in the internal energy of the gas? Include the algebraic sign.
Do b) first using E = 3/2 N k T. Answer to a) then follows from the fact that the internal energy change is 100% due to work performed.