# If 20.00 moles of calcium reacted, how many grams of calcium oxide are produced?

##### 1 Answer

#### Explanation:

First you need to create the skeletal equation for the reaction. Since calcium oxide (CaO) is produced, oxygen (

Skeletal equation:

**Balance the equation** based on the law of conservation of mass. Since there are two oxygen atoms on the left, a

Now you need to have

This equation is balanced. The equation says that for every two moles of calcium, there are two moles of calcium oxide produced.

The molar mass of CaO

If you take into consideration significant figures (SF), the smallest number of SF is 4. This would mean your answer should be