Question

calculate the approximate number of molecules in a drop of water with a mass of 0.10g

Answer 1

Explanation:

number of molecules = number of moles* Avagadro number

number of moles =mass/molarmass

mass =0.1

molarmass=18

Number of moles=0.1/18= 0.0055

Number of molecules= 0.0055*6.022*10^23

One molecule of water has three atoms (2 hydrogen and 1 oxygen atom)

Number of atoms= 3*0.0055*6.022*10^23

=0.10 *10^23