How many moles of copper sulfate are needed to make 2.50 Liters of 0.125 moles solution?

0.125 Molar solution!

Molarity = moles of solute/Liters of solution

Algebraically manipulated,

Moles of copper sulfate = 2.50 Liters * 0.125 M

= 0.313 moles copper sulfate needed

===========================