If 1 ml of water contains 20 drops. Then no. of molecules in a drop of water is

Options

A. `6.022 xx 10^(23)` molecules
B. `1.376 xx 10^(26)` molecules
C. `1.344 xx 10^(18)` molecules
D. `4.346 xx 10^(20)` molecules

Answer

C

Explanation

22400mL of water contains = `6.022 xx 10^(23)` molecules
1mL of water contains ` = (6.022 xx 10^(23))/(22400)` molecules
= 20 drops
`therefore ` 1 drop of water will contain ` = (6.022 xx 10^(23))/(224 xx 2 xx 10^(3))`
` = 1.344 xx 10^(18)` molecules