How many grams of copper is in 1L solution containing cuso4.5h20?
And the atomic weight of Cu is 63.55 g so the weight fraction of Cu is 63.55/249.68 = 0.255. Alternatively, for every mole of the hydrated copper sulfate there is 63.55 g of Cu but we have to have more information. If it is a one molar (1 M) solution, then there are 63.55 g of copper and so forth. The question is missing essential information.