Question

How many grams are there in 3.4 x 10^24 atoms of He?

Group of answer choices
2.07
5.7 g
0.57 g
20.7

Answer 1

Given :

Number of He atoms,
`n = 3.4* 10^(24)` atoms.

To Find :

How many grams are their in given number of He atoms.

Solution :

We know, molecular mass of He is 4 g. It means that their are
`6.022 * 10^(23)` atoms in 4 g of He.

Let, number of gram He in
`3.4* 10^(24)` atoms is x , so :

`x = (3.4* 10^(24))/(6.022* 10^(23))* 4\\\\x = $$22.58\ g`

Therefore, grams of He atoms is 22.58 g .