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

Mar 21, 2018

$G a$

#### Explanation:

The molecule of this compound is ${E}_{2} {O}_{3}$ 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 $E$.
$n \left(O\right) = \setminus \frac{m}{M} = \setminus \frac{25.53}{16} = 1.595625$mol
$n \left(E\right) = \setminus \frac{1.595625}{1.5} = 1.06375$mol
$n \left(E\right) = \setminus \frac{m}{M} = \setminus \frac{74.47}{x} = 1.06375$
$x = 70$
$70$ weighs $G a$