The molecular weight of NaCl is 58.44g/mol, the Atomic Mass of Na is 22.99 and the atomic mass of Cl is 35.45 when added together we get 58.44 g/mol.
The molecular weight of BaCl2 is 208.233g/mol, the atomic mass of Ba is 137.327 and the atomic mass of Cl2 is (35.453)(2) = 70.906 when added together we get 208.233g/mol
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