The mass of MgSO4.xH2O is 4.312g. The mass of MgSO4 is 2.107g. The mass of H2O is 2.205g. What is x?
1. Calculate the amount, in mol, of MgSO4: M(MgSO2)=24.3+32.1+(16x4)=120.4g mol^-1. n(MgSO4)=2.107/120.4=0.0175mol. 2. Calculate the amount, in mol, of water: 2.205/18=0.1225. 3. Determine the formula of the hydrated salt: 0.0175:0.01225=1:7. x=7.
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