(i) 58.5 amu are termed as formula mass and not moleculer mass of NaCl. Why?
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As NaCl is an ionic compound. Ionic compounds often form crystals. Also, they cannot exist as individual, neutral, and independent molecules. Hence, term formula mass is used to express the mass of ionic compound instead of molecular mass. This is the reason 58.5 amu are termed as formula mass and not molecular mass of NaCl.
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