Question

what mass of oxygen O2 will contain the same number of molecules as 6.4 g of sulphur dioxide SO
2​

Answer 1

Answer:

Explanation:

14 mole of sulphur dioxide will have the same number of molecular as 14 mole of oxygen. So, we should now convert 14 mole of oxygen into mass in grams. Thus, 8 grams of oxygen will contain the same number of molecules as 16 grams of sulphur dioxide.

Answer 2

Given:

The weight of the sample of sulfur dioxide = 6.4g

To Find:

The mass of oxygen that will contain the same number of molecules as the sample

Solution:

1.6g of oxygen will contain the same number of molecules as 6.4 g of sulfur dioxide.

We know that equal moles of substances contain an equal number of molecules.

And the number of moles of a substance = Mass of the sample / Molar mass of the substance

The molar mass of SO₂ = 1 X 32 + 2 X 16 = 64g

The molar mass of O₂ = 2 X 16 = 32g

The number of moles of SO₂ in the given sample = 6.4 / 64

= 0.1 moles

So 0.1 moles of oxygen will have the same number of molecules as 6.4 g of sulfur dioxide.

Mass of 0.1 moles of O₂ = 0.1 X Molar mass of O₂

= 0.1 X 16

= 1.6g