Question

1.Justify whether the following closed system processes have ?U, q,w and ?H increase, decrease or remain the same (0).

a) a gas (closed system) is expanded isothermally (gas pressureremains under 5atm of pressure)

b) temperature of gas (closed system) is decrease while its volumeremains constant.

C) Ne(1 mole, gas,1 bar,473k)-------Ne (1 mole, gas,1 bar,273k)where the external pressure is equal to 1 bar too.

d) a gas expands in a vacum surrounding(e.g Outer space)