Epsom salts are hydrates of magnesium sulfate the formula, Ask an Expert

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Epsom salts are hydrates of magnesium sulfate. The formula for Epsom salts is MgSO4 . xH2O. A 7.834g sample is heated until a constant mass of 3.825g is obtained, indicating that all the water has been evaporated off. What is the value of x in the formula of this hydrate?

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