The 25 mL of a 0.15 M solution of lead nitrate, Pb(NO₃) ₂ reacts with all of the aluminum sulfate, Aₗ₂(SO₄) 3, present in 20 mL of a solution. What is the molar concentration of the Aₗ₂(SO₄) ₃?
a) 0.375 M
b) 0.563 M
c) 0.750 M
d) 1.125 M