Question

In III A group element oxide is `25.53`% oxygen. What is the element?

Answer 1

`Ga`

Explanation:

The molecule of this compound is `E_2O_3` so
2n(`E`):3n(`O`)
n(`E`):1.5n(`O`)
In 100 grams of this compound are `25.53` grams `O` and `100-25.53=74.47` grams `E`.
`n(O)=\frac{m}{M}=\frac{25.53}{16}=1.595625`mol
`n(E)=\frac{1.595625}{1.5}=1.06375`mol
`n(E)=\frac{m}{M}=\frac{74.47}{x}=1.06375`
`x=70`
`70` weighs `Ga`