Chemistry - Mole Concept Question with Solution | TestHub

Weight = volume$\times$density
$=0.05\times 1=0.05$g
Number of molecules$\text{=}\frac{\text{weight}}{\text{molecular}\text{weight}}\text{×}{\text{N}}_{\text{A}}$
$=\frac{0.05}{18}\times 6.023\times 10^{23}$
$=1.667\times 10^{21}$molecules