MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryMole _ Equivalent ConceptAtomic and Molecular Masses

What’s the formula mass of NaCl?

A.23 u

B.35.5 u

C.58 u

D.58.5 u✓ Correct

Explanation

As Cl in NaCl can’t exist in the solid state, we can only calculate it’s formula mass. The individual mass of sodium is 23 u. whereas that of chlorine is 35.5 u. Together formula mass of sodium chloride is the sum of individual masses, 23 + 35.5 = 58.5 u.

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