If you are already familiar with this thermodynamics concept and the potential, you should find the questions and the answers provided quite helpful as you are working with closed systems where the temperature and the volume are constant. Starting with the F = U - T S equation, you will be able to proceed with the calculations as you estimate the Helmholtz free energy function. You should take your time to look through the samples to understand the practical use. See at least one Helmholtz free energy example to proceed with your task correctly and get your estimations delivered on time.