50ml of 0.25M copper II sulphate evaporates to leave pentahydrate crystal of copper II sulpfate. find mass?

Question

50ml of 0.25M copper II sulphate evaporates to leave pentahydrate crystal of copper II sulpfate. find mass of the crystal formed?

Answer 1

First find out how many moles of copper sulphate you have:

0.050L x 0.25 moles/L = 0.0125 moles.

Now find the mw of CuSO4.5H2O

63.5 + 32.1 + 4(16.0) + 5(1.0 + 1.0 + 16.0) = 249.6

249.6 g/mole x 0.0125 moles = 3.12g