Question

the number of water molecules present in a drop of water weighing 0.05mg is ​

Answer 1

Explanation:

A drop of water is 0.05 mL of water, so its volume would be 0.05 grams. One mole of water is 18.016 grams, so in 0.05 grams, in 1 drop, the amount of moles is moles of water in one drop =

0.05 grams x (1 mole/18.016 gram)

moles of water in one drop = 0.002775 moles.