Mass of hydrated salt = 5.567 g
Mass after heating = 2.719 g
Epsom salts, a strong laxative used in veterinary medicine, is a hydrate, which means that a certain number of water molecules are included in the solid structure. The formula for Epsom salts can be written as MgSO4 xH2 O, where x indicates the number of moles of H2O per mole of MgSO4. When 5.567 g of this hydrate is heated to 250 oC, all the water of hydration is lost, leaving 2.719 g of MgSO4.
You may want to reference (Pages 99 - 102) Section 3.5 while completing this problem.
What is the value of x?
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