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Atoms and Molecules · Class 9 · CBSE Science

What is the molecular mass of water (H2O)? (Given atomic masses: H = 1text{ u}, O = 16text{ u})

Practice question from Atoms and Molecules (Class 9 · CBSE Science), with the correct answer and a step-by-step solution.

easy · MCQ · Q-47FAD1

What is the molecular mass of water (H2OH_2O)? (Given atomic masses: H=1 uH = 1\text{ u}, O=16 uO = 16\text{ u})

  1. A.17 u
  2. B.18 uCorrect answer
  3. C.16 u
  4. D.34 u

Solution

Molecular mass of H2OH_2O = (2×atomic mass of H)+(1×atomic mass of O)=(2×1)+(1×16)=2+16=18 u(2 \times \text{atomic mass of } H) + (1 \times \text{atomic mass of } O) = (2 \times 1) + (1 \times 16) = 2 + 16 = 18\text{ u}.

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