During the preparation of Plaster of Paris, Gypsum is carefully heated to . If of Gypsum () undergo this ideal decomposition, what is the total number of moles of water () released as vapor?

Question

During the preparation of Plaster of Paris, Gypsum is carefully heated to $393	ext{ K}$. If $2 	ext{ moles}$ of Gypsum ($CaSO_4 \cdot 2H_2O$) undergo this ideal decomposition, what is the total number of moles of water ($H_2O$) released as vapor?

Prashant Kotian · Accepted Answer

Correct answer: 3. The balanced decomposition reaction is: (or equivalently ). From the stoichiometry, heating 2 moles of gypsum releases 3 moles of water.

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