Question
The formula mass of water H2O is
- 33
- 17
- 10
- 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
