Question

4.Calculate the volume of 40g of Helium (He) at rtp.

Answer 1

2.24dm³

Step-by-step explanation:

Given parameters:

Mass of He = 40g

Unknown:

Volume of Helium = ?

Solution:

To solve this problem, we convert the given mass to number of moles.

Number of moles =
`(mass)/(molar mass)`

molar mass of He = 4g/mol

Number of moles =
`(4)/(40)` = 0.1mole

So;

1 mole of gas at rtp occupies a volume of 22.4dm³

0.1 mole of He will occupy a volume of 0.1 x 22.4 = 2.24dm³