'SO₂ is an air pollutant released during burning of fossil fuels & from automobile exhaust'.

1. Write the names of elements present in this gas.
2. What is the valency of sulphur in SO_{2 &} SO_3.
3. FInd out the no: of molecules in 5 moles of SO_2.
4. Calculate the no : of moles in 320 g of SO_{2 gas}
5. Calculate the molarmass of 10 moles of sodium sulphite.
   (with Explanation please)

1. Elements present in SO₂ gas are: S- Sulphur

                      O - Oxygen

2. Valency of S in SO₂: +4

  Valency of S in SO₃: +6

3. Number of molecules in 5 moles of SO₂:

1 mole of SO2 contains = 6.023*10²³

5 moles of SO2 contains = 5 * 6.023*10²³ = 30.115*10²³ molecules

4. Number of moles in 320 g of SO₂ :

64g SO₂ makes = 1 mole

320 g SO₂ will make = 320 / 64 = 5 moles

5. Molar mass of 10 moles of sodium sulphite:

Molar mass of 1 mole of sodium sulphite = 126 g

Molar mass of 10 mole of sodium sulphite = 126 g * 10 = 1260 g