Determine the mass of CuSO4.5H20 needed to make 100.00mL of a .100M CuSO4.5H20 aqueous solution..

Answer 1

.100M solution has .100 mol/L
You only want 100mL, so you only need .01mol

just multiply the molecular mass of the compound by .01 to get the mass in g.

Answer 2

0.05