Question

what is the number of atoms in 10 litres of the ammonia?

Answer 1

22.4 litres occupy 6.023 x 10^(23) atoms

10 litres occupy x 


x = 6.023 x 10^(24) / 22.4 = 0.2688 x 10^(24) atoms = 2.688 x 10^(23) atoms

Answer 2

One mole of any gas occupies about 22.4 litres of space at STP. Also, I mole contains Avogadro's number of molecules.So, one mole of NH3 occupies 22.4 litres and has 6.022 × 10^23 molecules. Therefore 1 litre contains 1 ÷ 22.4 moles.Thus: 10 litres contain 10 ÷ 22.4 moles.Therefore :10 litres contain about 0.446 moles of NH3. Now for number of molecules: 1 mole of NH3 contains 6.022 × 10^23 molecules.Thus 0.446 moles of NH3 contain 6.022 × 10^23 × 0.446 molecules = 2.6851 × 10^23 molecules. Multiply by 4 for number of atoms. This gives final answer:2.6851 × 4 × 10^23 ATOMS.