Question

A compound is decomposed by an electric current giving 19.98 % g O and 2.52 g H

What is the % composition of this compound. (find the % by mass of each element)

Answer 1

We have to calculate the percentage composition of the compound.

The answer is: amount (in mass percentage) of oxygen is 88.8 % and amount (in mass percentage) of hydrogen is 11.2 %.

We know atomic mass of oxygen is 16 and atomic mass of hydrogen is 1.

The amount of Oxygen produced= 19.98 g and amount of Hydrogen produced= 2.52 g. So, total amount of the compound is: (19.98 + 2.52) g= 22.50 g.

So, mass percentage of oxygen is (Mass of oxygen produced/ total mass of compound) X 100 =
`(19.98 X 100)/(22.50)`= 88.8 %

Masspercentage of hydrogen is: (Mass of hydrogen produced/ total mass of compound) X 100 =
`(2.52 X 100)/(22.50)`= 11.2 %.