During an adiabatic process, 20 moles of a monatomic ideal gas ...

[APUS57]

During an adiabatic process, 20 moles of a monatomic ideal gas undergo a temperature change from 450 K to 320 K starting from an initial pressure is 400 kPa. The ideal gas constant is R = 8.314 J/mol  K.
 
  (a) What is the final volume of the gas?
  (b) How much heat does the gas exchange during this process?
  (c) What is the change in the internal (thermal) energy of the gas during this process?

Question 2

A stone is held at a height h above the ground. A second stone with four times the mass of the first one is held at the same height. The gravitational potential energy of the second stone compared to that of the first stone is
 
  A) one-fourth as much.
  B) one-half as much.
  C) twice as much.
  D) four times as much.
  E) the same.

[scikid]

Answer to Question 1

(a) 0.31 m3 (b) 0.00 J (c) -32 kJ

Answer to Question 2

D

[APUS57]

Wow, this really help

[parshano]

Great answer, keep it coming