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

1 Answer
Martyna
Mar 21, 2018

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}=1.595625mol
n(E)=\frac{1.595625}{1.5}=1.06375mol
n(E)=\frac{m}{M}=\frac{74.47}{x}=1.06375
x=70
70 weighs Ga

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