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Question

calculate the formula unit mass of plaster of paris

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Solution

The chemical formula of Plaster of Paris is (CaSO₄)₂. H₂O. So, the formula unit mass of Plaster of Paris can be calculated as follows
formula unit mass of Plaster of Paris = 2 X atomic mass of calcium + 2 X atomic mass of sulphur + 9 X atomic mass of oxygen + 2 X atomic mass of Hydrogen
= (2 X 40) + (2 X 32) + (9 X 16) + (2 X 1)
= 290 u.

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