The Helmholtz free energy (A) of a thermodynamics system in terms of volume (V) and temperature (T) is given by A = a + bT (1 - lnT) - cT lnV where a, b and c are constants. The enthalpy (H) of the system is
1
a + (b + c) T
2
b lnT + c lnV
3
a + bT
4
b lnT - c lnV