Answer :
Final answer:
The formula mass of sodium chloride is 58.5, calculated by adding the atomic masses of sodium (23) and chlorine (35.5).
Explanation:
The formula mass of a substance is the sum of the atomic masses of each atom in its empirical formula. The empirical formula of sodium chloride (NaCl) is made up of one sodium (Na) atom and one chlorine (Cl) atom.
The atomic mass of sodium is 23 and of chlorine is 35.5. Therefore, the formula mass of sodium chloride (NaCl) is 23 (for Na) + 35.5 (for Cl) = 58.5.
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