An Ideal Gas with γ = 1

Multiple Choice

An ideal gas with γ = 1.67 is initially at 0°C in a volume of 10.0 L at a pressure of 1.00 atm.It is then expanded adiabatically to a volume of 10.4 L.What is the final temperature of the gas?

A) -7.1°C
B) 2.5°C
C) -23°C
D) 68°C
E) -20°C