Epsom salt is a hydrate with a formula mgso4xh2o where x, Ask an Expert

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Epsom salt is a hydrate with a formula MgsO4.xH2O, where x indicates the number of moles of H2O per mole of MgSO4. After a 1.687 g sample of the hydrate is heated, 0.824 of MgSO4 remains. How many molecule of water are present per formula unit of MgSO4?

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