What is the molarity of each of the following solutions: (a)

What is the molarity of each of the following solutions:
(a) 15.0 g Al2(SO4)3 in 0.250 mL solution,
(b) 5.25 g in 175 mL of solution,
(c) 35.0 mL of 9.00 M H2SO4 diluted to 0.500 L?