Asys=?

A process at constant T and V is spontaneous if Asys=?

Please clearly explain each part. thank you.

=- In class we defined the Gibbs Free Energy G =H-TS for a system, and we showed that for processes at constant temperature and pressure, AGsys = - TASuniv. We can also define another quantity called the Helmholtz Free Energy, A = U-TS, for a system. Calculate the relationship between AAsys and ASuniv for processes at constant temperature and volume, and rephrase the second law of thermodynamics ("a process is spontaneous if AS univ> 0) in terms of AAsys for such processes