Question

Calculate the percentage composition of hydrogen and
oxygen in water molecule. [H = 1 and O = 16]

Answer 1

Answer:

The percentage of an element in a compound is 100 times the fraction, so for water the mass percent hydrogen is 11.11% and the mass percent oxygen is 88.89%.

Answer 2

The percentage composition of hydrogen and oxygen in a water molecule is $11.11\%$ and $88.89\%$respectively.

Explanation:

To calculate  the percentage of Hydrogen and Oxygen:

Molecular weight of $H_2O$ = 2 * molecular weight of Hydrogen + Molecular weight of Oxygen

Molecular weight of $H_2O$= 2 * 1 + 16

Molecular weight of $H_2O$ = 18 $gm\ mol^{-1}$.

Percentage = $\frac{Value}{Total\ Value} * 100$

Substituting:

For hydrogen = $\frac{2}{18} * 100$

Hydrogen = 11.11%

For oxygen = $\frac{16}{18}* 100$

Oxygen = 88.89%