How many moles of water are lost per mole of gypsum, $\mathrm{CaSO}{}_4\cdot 2\mathrm{H}{}_2\mathrm{O}$, when it is converted completely into plaster of Paris?

More questions on Important compounds: NaOH, Na2CO3, NaHCO3, CaO, CaCO3, plaster of Paris

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