Answer :
Avogadros constant says that there are 6.02x 10^23 particles in one mole of a substance.
4.5 x 6.02 x 10^23 = 2.709 x 10^24
Let me know if you have any questions
4.5 x 6.02 x 10^23 = 2.709 x 10^24
Let me know if you have any questions