# How many formula units are contained in .67 g #CaO#?

##### 1 Answer

#### Explanation:

First you need to determine the number of **moles** in

To determine the **molar mass** of a compound, add the atomic weight on the periodic table in g/mol times each element's subscript.

Since the formula unit

**Molar Masses of Calcium and Oxygen**

**Molar Mass of Calcium Oxide**

Add the molar masses.

**Determining Moles CaO**

To determine the number of moles of formula units in the given mass of

I'm keeping some extra digits in order to reduce rounding errors. The final answer will be rounded to two significant figures.

**Determine Formula Units of CaO**

Now multiply the number of moles of formula units by