A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water

A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound. Write the chemical equation for its preparation. For what purpose is it used in hospitals?

The compound is Plaster of Paris or calcium sulphate hemihydrate.
The chemical equation for the preparation of Plaster of Paris is:

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