Question

how can the number of atoms in 10 litres of ammonia be equal to 1.786*6.023*10^23

Answer 1

1 molecule of NH3 contains 4 atoms

therefore 1 mole of NH3 contains 4 moles of atom

As 1 mole =6.022*10 raise to 23 atoms.

1 mole of ammonia contain=4*6.022*10 raise to 23

As we know at STP.1 mole of any gas occupies a constant volume i.e 22.4

Hence in 22.4 L contain →24.08*10 raise to 23

therefore 1 L contain →(24.08 × 10^23)/22.4 atoms (^ is for raise to)

therefore 10 L contain→(1.07 × 10^23) * 10 atoms

Hence 10 L of ammonia gas contain 1.07*10^23 and we can also say

1.07*10^24