MCQ
Relative molecular mass of water is $ .........$
- ✓$18$
- B$16$
- C$12$
- D$14$
✓
Answer
Correct option: A.
$18$
Relative molecular mass for water $\ce{(H_2O)}$
$= 2\ \times $ relative atomic number for hydrogen $+\ 1\ \times $ relative atomic number for oxygen
$= 2 \times 1 + 1 \times 16$
$= 18$
$= 2\ \times $ relative atomic number for hydrogen $+\ 1\ \times $ relative atomic number for oxygen
$= 2 \times 1 + 1 \times 16$
$= 18$
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