Question

MCQ : The formula mass of water H2O is

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Answer

Question

The formula mass of water H2O is

  1. 33
  2. 17
  3. 10
  4. 18

Answer

18

Explanation

The formula mass of water (H2O) is 18.

The formula mass is the sum of the atomic masses of all the atoms in a chemical formula. For water, the formula mass is:

Formula mass of H2O = 2 × (atomic mass of H) + atomic mass of O

= 2 × 1  + 16 = 18

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