# How many atoms are in 1 mole of #Na_3PO_4#?

##### 1 Answer

#### Explanation:

In order to figure out how many *atoms* you get **per mole** of sodium triphosphate, **one mole** of any substance contains

This is known as **Avogadro's number**.

Since you're dealing with an **ionic compound**, one mole of sodium triphosphate will contain

*Now, how many atoms do you get per formula unit of sodium triphosphate?*

As you can see by examining the chemical formula, one formula unit contains

threeatoms of sodium# -> 3 xx "Na"# oneatom of phosphorus# -> 1 xx "P"# fouratoms of oxygen# -> 4 xx "O"#

This means that one formula unit will contain a total of

#3 xx"Na" + 1 xx "P" + 4 xx "O" = "8 atoms"#

Therefore, **one mole** of formula units will contain

#6.022 * 10^(23)color(red)(cancel(color(black)("formula units"))) * "8 atoms"/(1color(red)(cancel(color(black)("formula unit")))) = 4.82 * 10^(24)"atoms"#

You should round this off to one **sig fig**, the number of sig figs you have in

#"no. of atoms" = color(green)(| bar(ul(5 * 10^(24)"atoms"))|)#