AP Chemistry
1.3 Elemental Composition of Pure Substances
1.1 Moles and Molar Mass
A student heats a \(1.56 \text{ g}\) sample of hydrated magnesium sulfate, \(\text{MgSO}_4 \cdot x\text{H}_2\text{O(s)}\), in a crucible until all water of hydration is driven off. The remaining anhydrous \(\text{MgSO}_4\text{(s)}\) has a mass of \(1.20 \text{ g}\). The molar mass of \(\text{MgSO}_4\) is \(120 \text{ g/mol}\) and the molar mass of \(\text{H}_2\text{O}\) is \(18 \text{ g/mol}\). What is the value of \(x\)?
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