Question

once kg of air expand at a constant temperature from a pressure of 820 kpa and a volume of 3 m³ to a pressure of 220 kpa. determine. a. change of Internal Energy b. change of Enthalpy

Answer 1

a)

$\Delta T=0,\implies U=0~ J,$

b)

$H=U+p(V_2-V_1)=p(V_2-V_1)=1.8~MJ.$