Question

how many He atoms present in 2.24 litre Helium gas at STP​

Answer 1

Answer:

6.022*10²²

Explanation:

volume at STP=moles*22.4

2.24=moles*22.4

moles=2.24/22.4

moles=1/10

moles=0.1

no. of atoms of He

=no.of molecules*total no. of He atoms

=moles*NA*total no. of He atoms

=0.1*6.022*10²³*1

=0.1*6.022*10²³

=0.6022*10²³

=6.022*10²²