Question

Find the number of H atoms in $9.033\times {10}^{23}$ molecules of water.

• A. 18.066*10²³
• B. 9.033×10²³
• C. 6.022*10²³
• D. 7.55*10²³

Answer 1

The correct option is A

18.066*10²³

The chemical formula of water is ${\text{H}}_2\text{O}$.
Clearly, one molecule of water has 2 hydrogen atoms.
$9.033\times {10}^{23}$ molecules of water will have $2\times 9.033\times {10}^{23}=18.066\times {10}^{23}$ atoms of hydrogen.