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Standard IX
Chemistry
Molecular Mass
Question

What is the formula unit mass of sodium chloride?
  1. 58.5
  2. 35.5
  3. 23
  4. 40

A
23
B
58.5
C
35.5
D
40
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Solution
Verified by Toppr

The formula of sodium chloride is NaCl
Atomic weight of sodium (Na) is 23 g/mol
Atomic weight of chloride (Cl) is 35.45 g/mol
Therefore, the formula unit mass of sodium chloride (NaCl) is 23+35.45=58.45 g/mol which nearly equals to 58.5 g/mol
Hence, option A is correct.

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What is the formula unit mass of sodium chloride?
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