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Question: How can you obtain the formula for the hydrate from the moles of anhydrous MgSO4 and the moles of water?

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To obtain the formula for the hydrate from the moles of anhydrous MgSO4 and the moles of water, you need to find the ratio between the moles of MgSO4 and the moles of H2O in the hydrate. 1. First, determine the moles of anhydrous MgSO4 and moles of water that you have: For example, let's say you have: moles of anhydrous MgSO4 = 0.1 mol moles of water = 0.5 mol 2. Next, find the mole ratio between MgSO4 and H2O by dividing both moles by the smallest number of moles: In our example, 0.1 mol MgSO4 / 0.1 mol = 1 mol MgSO4 0.5 mol H2O / 0.1 mol = 5 mol H2O 3. Write the hydrate formula using the mole ratio: In this case, the formula for the hydrate is MgSO4•5H2O, meaning there are 5 water molecules associated with each molecule of MgSO4 in the hydrate. It's important to note that different hydrates will have different amounts of water molecules associated with the anhydrous compound, and the ratios might not always be whole numbers. Always round the ratio to the nearest whole number when writing the hydrate formula.

May 16, 2023, 5:11 a.m.

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