Calculate the percent composition of copper in the hydrate CuSO4----5H2O based on the atomic weight data.

You can find that easily. Find the mass of copper in your formula. Ok? Now find the total mass of your formula (or substance). Since it is percantage, the divide the smaller value, that is the mass of copper by the total mass of the substance, then multiply by 100 to have the percentage.

Hope it helped!:)