Gypsum, CaSO₄ · 2H₂O (172 g/mol), is heated to make plaster of Paris, CaSO₄ · 1/2H₂O (145 g/mol). What mass of plaster comes from 86 g of gypsum?

ChemistryHardHigh School (9–10)GeneralAcids, Bases and Salts › Salts and Their Uses

Gypsum, $\text{CaSO}_4 \cdot 2\text{H}_2\text{O}$ ( $172\ \text{g/mol}$ ), is heated to make plaster of Paris, $\text{CaSO}_4 \cdot \tfrac{1}{2}\text{H}_2\text{O}$ ( $145\ \text{g/mol}$ ). What mass of plaster comes from $86\ \text{g}$ of gypsum?

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← A grocer weighs out 100 g of washing soda crystals (286 g/mol). How many grams of that is water of crystallisation?How much water is driven off when 344 g of gypsum (172 g/mol) is changed into plaster of Paris? Use H₂O = 18 g/mol. →

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