Question

what is the percent composition of hydrogen in water (h₂o)?

Explanation:

Step1: Calculate molar mass of \(H_2O\)

Molar mass of \(H = 1\space g/mol\), molar mass of \(O=16\space g/mol\).
Molar mass of \(H_2O=(2\times1)+16 = 18\space g/mol\)

Step2: Calculate mass of hydrogen in \(H_2O\)

Mass of hydrogen in \(H_2O = 2\times1=2\space g/mol\)

Step3: Calculate percent composition of hydrogen

Percent composition of \(H=\frac{\text{Mass of }H}{\text{Molar mass of }H_2O}\times100\%=\frac{2}{18}\times 100\% \approx 11.11\%\)

Answer:

11.11%