# How do you solve empirical formula calculations?

##### 1 Answer

The explanation is given below.

#### Explanation:

**Step 1** : Assume percentages as masses contained in a total of 100 grams.

**Step 2** : Use

**Step 3** : Divide all number of moles by the smallest.

**Step 4** : Round them to nearest whole numbers and assign as subscripts.

Example question: Calculate empirical formula of a compound that has

Assume that 100 grams contains

To move on to step 2, you also need to know the molar mass of

Now you can find the number of moles for each atom.

Step 3, multiply the number of moles by the smallest.

*Has been rounded to nearest whole number

Step 4, assign them as subscripts.

Since there is 2 Hydrogen and and 1 Oxygen, you know that the empirical formula is