Question

14. If the molecules in a given sample of sulphur dioxide is 3.011x1023.Calculate the following
a.Number of moles in the given sample.
b.Mass of sulphur dioxide in the given

Answer 1

Answer:

Sulphur dioxide is SO2

According to mole concept:

1 mole of a molecule = 6.023 x 10^23 molecules

therfore:

1 mole of SO2 molecule = 6.023 x 10^23 molecules of SO2

Number of moles = Number of molecules/Avogadros number

Avogadros number = 6.023 x 10^23

Number of molecules of SO2 = 3.011 x 10^23

Moles of SO2 = Number of molecules/Avogadros number

= 3.011 x 10^23/6.023 x 10^23 = 0.5 mole

Now

1 mole of SO2 contains 1 mole of Satoms, and 2 moles of Oxygen atoms

1 mole of SO2 = 2 moles of Oxygen atom

therfore, moles of Oxygen = 2 x moles of SO2 = 2 x 0.5 = 1 mole

There is 1 mole of Oxygen atom in given sample of SO2

as 1 mole of atom = 6.023 x 10^23 atoms

therfore 1 mole of O atom = 6.023 x 10^23 oxygen atoms

Hence SO2 contains 6.023 x 10^23 Oxygen atoms