# Chapter 2 - Chemical Compounds - Exercise 2.19 - Amount of an Ionic Hydrate - Page 8: a

The molar mass for the Epsom salt is equal to 246.52g/mol.

#### Work Step by Step

According to the table 2.13, Epsom salt is $MgSO_4$ hydrated with 7 $H_2O$ molecules. $Mg:$ 24.31* 1 + $S:$ 32.07* 1 + $O:$ 16.00* 4 =120.38g/mol And we have 7 water molecules with it: $H_2O:$ $7 * (1.01(H) * 2 + 16.00 (O) * 1) = 7 * (18.02) = 126.14g/mol$ Adding those 2 molar masses: $126.14 + 120.38 = 246.52g/mol$

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