Question

Q 9 Calculate the number of atoms in 16 gram of
moles of the He (He=2u)​

Answer 1

given

16 gram of moles of He (He=2u)

the atomic number of Helium=2

mass number of Helium=4

we know one mole of He contains avagadro number of atoms

i.e, 6.023×10^23 atoms

one mole of Helium=4grams of Helium

from given 16 grams of Helium converting into moles

we get number of moles of Helium=16/4=4moles

so the number of atoms in 16 grams of He

=4×6.023×10^23=24.092×10^23=2.4092×10^24 atoms of Helium