Question

Calculate the number of neutrons in $18mL$ of water. (Density of water $=1$).

Answer 1

Mass of $18ml$ water=$18gm$

no. of moles=$\frac{18}{18}=1mole$

Total molecules=$6.023\times {10}^{23}\times 1=6.023\times {10}^{23}$

One molecule water have $8$ neutrons

Total number of neutrons=$=8\times 6.023\times {10}^{23}=48.16\times {10}^{23}$