How do you do part a and b of this question please

3. Section B Answer (a), (b) and (c) (a) Define the chemical potential, . [5 marks] (b) Consider the mixing of two ideal gases A and B; before mixing the pressure of both gases is p and there are nA and nB moles of A and B respectively. After mixing the pressure remains the same. Justify the statement that mixing of the ideal gases A and B occurs spontaneously in all proportions. [15 marks]