A hydrate is a compound with water molecules incorporated into its crystal structure. In an experiment to find the percentage of water in the compound, the following data was recorded. Use the data and determine the percentage of water in the compound?

Divide the mass of the water lost by the mass of hydrate and multiply by 100. The theoretical (actual) percent hydration (percent water) can be calculated from the formula of the hydrate by dividing the mass of water in one mole of the hydrate by the molar mass of the hydrate and multiplying by 100.