# A certain manganese oxide contains 72% manganese. What is the empirical formula?

##### 1 Answer

May 1, 2017

Since

#### Explanation:

We convert the mass ratio into mol ratio:

Then 72g of this is Manganese.

The molar mass of

The 28g of Oxygen (molar mass

The mol ratio

Empirical formula:

**Note:**

This works if you take any other sample size, but then there are more calculations to do.