Question

Calculate the no of neutrons in 18ml of water

Answer 1

18ml of water has 18g weight

Number of moles =Mass ÷molecular mass

Molecular mass of water is 18.

And we have 1 mole of water

so

According to Avogadro number 1 mole contain 6.023×10^23 atoms

Hydrogen atom contain 0 neutron

And

Oxygen contain 8neutron in 1 atom of water

so

number of neutron required

=8×6.023×10^23

=48184×10^20 neutrons