Reference Table Review

Solve molar mass and then divide mass from each element by the molar mass. N = 28.1%, H = 8.1%, P = 20.8%, O = 43.0%. What is the percent, by mass, of water in MgSO4.2H2O? Find molar mass of MgSO4 and add to it the mass of 2x molar mass of water = 120.3 + 2(18) = 156.3 is total mass of the hydrate. 36/156.3 = .23 or 23% of the mass is from water ................
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