Question

Calculate the number of gram atoms present in the following masses:-
i) 64g of oxygen
ii)140g of nitrogen​

Answer 1

no.of atoms = gvn mass/amu × avgd.no

Explanation:

• 1) 64 g of oxygen =64/16 ×6.023×10^23

= 4×6.023×10^23

= 24.08×10^23

• 2) 140 g nitrogen = 140/14×6.023×10^23

=10×6.023×10^23

= 60.23×10^23