How many moles of CuSO4 are used to make 250 ml of a 0.50 M CuSO4 solution?

In order to prepare a 250 ml solution of CuSO₄ of 0.5 M we need to calculate the amount of CuSO₄ requires. So, as we know,

Molarity = Moles / Volume of Solution

Also,

Molarity = (Mass : M. mass) / Volume of Solution

Solving for Mass,

Mass = Molarity * M. mass * Volume

Putting Values, ∴ 250 ml = 0.25 dm³

Mass = 0.5 mol. dm⁻³ * 159.6 g. mol⁻¹ * 0.25 dm³

Mass = 19.95 g

Step 2:

Take 19.95 g of CuSO₄, add it to volumetric flask and add distilled water upto the mark of 250 ml. The resulting solution will be of concentration 0.5 M.