Question

Calculate the mass per cent of each element of sodium chloride in one mole of it.

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Answer

Molecular mass of NaCl = (1 x 23 + 1 x 35.5) u = 58.5 u

Atomic mass of sodium = 23 u

Mass per cent of Na = (Atomic mass of Na / Molecular mass of NaCl) x 100

= (23 / 58.5) x 100

= 39.32%

Mass % of Na = 39.32 %

Atomic mass of chlorine = 35.5 u

Mass % of Cl = (Atomic mass of Cl / Molecular mass of NaCl) x 100

= (35.5 / 58.5) x 100

= 60.68 %

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