Question

calculate no of molecules in a drop of water weighting 0.05g

Answer 1

Hey mate!

Here's your answer!!

Molecular mass of water = 18 g

No. of moles in 0.05 g of water = 0.05/18

= 2.78 x 10^-3 mol

One mole = 6.0^23 x 10^23 molecules

Therefore,
2.78 x 10^-3 mol of water contain = 2.78 x 10^-3

6.0^23 x 10^23 molecules

= 1.67 x 10^21 molecules

$hope \: it \: helps \: you.$
✌ ✌

Answer 2

no.of molecules in one drop. of H2O molecule = avagadro no. × no of moles

=6.022×10^23×.003
=0.018066×10²³
=1.8×10²¹