Question

Compound containing the highest percent by mass of hydrogen is:

• A. $HCl$
• B. $H_{2}O$
• C. $H_{3}P{O}_4$
• D. $H_{2}S{O}_4$
• E. $HF$

Answer 1

The correct option is B $H_{2}O$

The compound containing the highest percent by mass of hydrogen is water $H_{2}O$.

For water, the percent by mass of hydrogen is $\frac{2\times 100}{18}=11.11$%.

For HCl, the percent by mass of hydrogen is $\frac{1\times 100}{36.5}=2.74$%.

For phosphoric acid, the percent by mass of hydrogen is $\frac{3\times 100}{98}=3.06$%.

For sulphuric acid, the percent by mass of hydrogen is $\frac{2\times 100}{98}=2.04$%.

For HF, the percent by mass of hydrogen is $\frac{1\times 100}{20}=5$%.