Question

calculate the percentage composition of hydrogen and oxygen in water atomic mass of hydrogen is 1 and atomic mass of oxygen is 16​

Answer 1

H =2\18x100 =11.1%,, O=16\18x100=88.9%

Answer 2

The percent composition of hydrogen and oxygen in water are 11.11 % and 88.89 % respectively

Explanation:

The chemical formula of water is $H_2O$

To calculate the percentage composition of substance in sample, we use the equation:

$\%\text{ composition of substance}=\frac{\text{Mass of substance}}{\text{Mass of sample}}\times 100$

• For hydrogen:

Mass of sample = [(2 × 1) + 16] = 18 g

Mass of hydrogen = (2 × 1) = 2 g

Putting values in above equation, we get:

$\%\text{ composition of hydrogen}=\frac{2g}{18g}\times 100=11.11\%$

• For oxygen:

Mass of sample = [(2 × 1) + 16] = 18 g

Mass of oxygen = 16 g

Putting values in above equation, we get:

$\%\text{ composition of oxygen}=\frac{16g}{18g}\times 100=88.89\%$

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