# What is the mass percent oxygen in sodium carbonate, Na_2CO_3?

##### 1 Answer
Jul 6, 2016

The mass percent pf Oxygen in $N {a}_{2} C {O}_{3}$ is 45.27%

#### Explanation:

To fond the mass percent oxygen we begin by finding the mass of the molecule $N {a}_{2} C {O}_{3}$

$N a = 2 \cdot 22.99 = 45.98$
$C = 1 \cdot 12.01 = 12.01$
$O = 3 \cdot 15.99 = 47.97$

$N {a}_{2} C {O}_{3} = 105.96$

Now divide the mass of Oxygen by the total mass of the molecule.

$\frac{47.97}{105.96} = .4527$

Multiply 100 to convert the decimal to a percent.

.4527*100= 45.27%