# What is the mass in grams of #9.76 * 10^12# atoms of naturally occurring sodium?

##### 1 Answer

#### Answer:

#### Explanation:

The important thing here is to ignore the *naturally ocurring* part and realize that you're dealing with sodium metal,

Now, you need to use two concepts to help you solve this problem

the molar mass of sulfurthe number of atoms you get per mole, also known asAvogadro's number

An element's **molar mass** tells you what the exact mass of **one mole** of said element is. Sodium has a molar mass of approximately **one mole** of sodium has a mass of

You also know that **one mole** of any element contains exactly

#"1 mole Na" = "23.0 g" = 6.022 * 10^(23)"atoms of Na"#

Therefore, that many atoms of sodium will have a mass of

#9.76 * 10^(14)color(red)(cancel(color(black)("atoms of Na"))) * "23.0 g"/(6.022 * 10^(23)color(red)(cancel(color(black)("atoms of Na")))) = color(green)(3.73 * 10^(-8)"g")#