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Answer: Molar mass is simply calculated by the sum of the atomic mass of all the atoms present in the molecule. The molecular mass unit is in grams per mole (g/mol). The molar mass of MgCl2 can be computed as the sum of the molar mass of Mg i.e 24.3 g/mol and the molar mass of two atoms of chlorine i.e 2×35.5 = 71g/mol.
Hence the molar mass of MgCl2 is 24.3 +71 =95.3 grams per mole (i.e. 95.3 g/mol).
