Stoichiometry: Molar Mass Quiz. To find the mass of a compound, you must add up the individual masses of its component elements. For example, table salt (NaCl) has two elements. The molar mass of sodium is 23g/mol. The molar mass of chlorine is 35.5g/mol. So when you add those together, you get the molar mass of salt, which is 58.5g/mol.
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