![]() ![]() 1.298 g anhydrate × 159.62 g 1 mol CuSO 4 ? = 0.008132 mol CuSO 4 ? The difference in mass between the hydrate and the anhydrate is the amount of water lost: First, we must find the starting mass of the hydrate: Then, we need to know the mass of the anhydrate: After heating: beaker + anhydrate 25.224 g Now, we can calculate the moles of anhydrate, knowing that the molar mass of the anhydrate is 159.62 g / mol. ![]() Determine the mole ratio of water to copper(II) sulfate. After heating, the mass of the beaker and anhydrate is 25.224 g. The combined mass of the beaker and copper(II) sulfate pentahydrate is 25.956 g. She then adds a sample of copper(II) sulfate pentahydrate, and re-weighs it. ![]() Moles anhydrate: Moles water: Results: Trial 1: H 2 ? O Trial 2: H 2 ? O (anhydrate) (anhydrate)Įxample 1: A student weighs an empty beaker and finds it to be 23.926 g. Empirical Formula of an Unknown Hydrate Formula of anhydrate of unknown: mg SO 4 Molar mass of anhydrate: 120.37 g / mol Calculate the empirical formula of the unknown as shown in Example 1.
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