Question

Determine the equivalent mass and number of moles of water of crystallization

Answer 1

Answer:

eg magnesium sulphate MgSO4.7H2O salt crystals

Relative atomic masses: Mg = 24, S = 32, O = 16 and H = 1

relative formula mass = 24 + 32 + (4 x 16) + [7 x (1 + 1 + 16)] = 246

7 x 18 = 126 is the mass of water

so % water = 126 x 100 / 246 = 51.2%