# What is the mass, in grams, of #3.40*10^22# atoms #He#?

##### 1 Answer

Jun 23, 2016

0.226 gram.

#### Explanation:

You can get to the answer in two steps:

- calculate:
#3.40*10^22# atoms =#color(red)x# mol ?

using Avogadro's constant. - calculate:
#color(red)x# mol =#color(red)?# grams,

using the atomic mass of Helium.

**Step 1**

Avogadro's constant says that

**Step 2**

The atomic mass of helium (He) will give you the weight of one mole of this molecule:

So the