# Question #24c67

##### 1 Answer

Jun 27, 2015

That much sodium nitrate contains

#### Explanation:

Since sodium nitrate is an ionic compound, you can't really say that you're dealing with *molecules*, but with **formula units**.

In order to calculate how many formula units a certain mass of a substance contains, you need to do two things

*determine how many moles are present in that many grams by using the substance's molar mass*;*determine how many formula units you have in that many moles by using Avogadro's number*.

So, use sodium nitrate's molar mass to determine how many moles are present in **2 g**

**Avogadro's number** tells you that *1 mole* of any substance contains exactly

This means that you have