Question

Percentage composition of oxygen in al2O3

Answer 1

It's : 48/102

= 47% is your answer.

Answer 2

SoluTion:

Given compound :

• $\sf{Al_{2} O_{3}}$ ( Aluminum oxide )

We've to find its percentage composition.

Let's find the molecular mass of aluminium oxide Firstly.

→ Molecular mass of Aluminium oxide = 27 ( 2 ) + 16 ( 3 )

→ Molecular mass of aluminium oxide = 54 + 48

→ Molecular mass of aluminium oxide = 102 g

$\rule{200}2$

Now, we have to find the percentage composition of oxygen in aluminium oxide.

→ $\sf{\dfrac{48}{102} \times 100}$

→ 47.05 %

Hence, percentage composition of oxygen in aluminium oxide is 47.05%