Question

A sample of He - gas has 5.03 x 10 23He atoms. What volume is occupied by this sample at s.t.p?

Answer 1

18.7L

Step-by-step explanation:

To solve this problem, we first find the number of moles the given number of atoms of He represents.

Number of atoms of He = 5.03 x 10²³ atoms

So;

6.02 x 10²³ atoms will contain 1 mole of He

5.03 x 10²³ atoms will have
`(5.03 x 10^(23) )/(6.02 x 10^(23) )` = 0.84mole of He

Now, the volume at STP;

1 mole of He will occupy 22.4L at STP

0.84 mole of He will occupy 0.84 x 22.4 = 18.7L at STP