Question

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

Answer 1

Answer:

2.24dm³

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  = $\frac{mass}{molar mass}$  

   molar mass of He  = 4g/mol

  Number of moles  = $\frac{4}{40}$   = 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