Question

9. The volume of a drop of water is 0.05 ml and the

density of water is 1.0 g/ml. How many water
molecules are present in a drop of water?
(1) 1.7 x 1021
(2) 5.4 x 1023
(3) 2.2 x 1026
(4) 1.7 x 1020​

Answer 1

Explanation:

How many molecules are there in a drop of wate if its volume is 0.05 mL ? 0.0028 mole of water contain molecules =6.022×1023×0.0028=1.68×1021 molecules.