Question

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

• A. $18.066\times {10}^{23}$
• B. $9.033\times {10}^{23}$
• C. $4.52\times {10}^{23}$
• D. $6.022\times {10}^{23}$

Answer 1

The correct option is A $18.066\times {10}^{23}$

The chemical formula of water is $H_{2}O$.
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.