Thermodynamics

BCD

ABCD

ACD

a b c

b and d

b, d

c

First turn X from liquid to gas

then X to X4

then comvert X4 from gas to liquid

NET of this is Delta H

b

c as dU = dW

so in order to do work we need to change volume and thus we need a moveable boundary

c is obv incorrect

d is false becuse during irreversible processes, state variables, ie P, T,V arent well defined and so we cant use ideal gas law

a

d