Question

Undergoing adiabatic (constant heat) expansion, 5.3 moles of hydrogen gas (H2) do 810 J of work. Does the gas temperature increase or decrease?

Answer 1

adiabatic also means no heat flow.

Answer 2

\(\Delta U=Q-W\) Adiabatic process implies \(Q=0\) so \(Delta U = -W\) so \(\Delta U<0\) but for an ideal gas, \(\Delta U \propto kT\) where \(k\) is a positive constant. Thos the temperature must decrease.