1.

In 22400 ml there are Na atoms

so in 1 ml there will be Na / 22400 atoms

so 36 ml there will be Na / 22400 * 36 atoms .

3.

caco3 --> cao + co2

1mole of caco3 gives 1 mole (22400 ml ) of co2

or 22400 ml of co2 is produced by 1mole of caco3

1 litre of co2 is produced by 1/ 22.4 mole of caco3

.56 litres of co2 is produced by 1/ 22.4 * .56 moles of caco3.

5.

Thanks for the free points!

Keep it up