Question

The mass of a neutron is 1.67×10^-24 g. How many neutrons would be needed to have the same mass as a salt crystal with a mass of 9.10×10^-2 g?

...........neutrons

Answer 1

Number of neutrons =$9.1× 10^-2 /1.67 ×10^-24$

=5.4×10²²