If 1 mL of water contains 20 drops, what is the number of water molecules in the one drop of water? (A = Avogadro's number)

Options

A. `(0.5)/(18)`A
B. `0.05`A
C. `(0.05)/(18)`A
D. 0.5 A

Explanation

c) `therefore` 18 mL = 18g of water contains = `20 xx 18` drops = A molecules
`therefore` 1 drop contians = (A)/(20 xx 18)` molecules = `(0.05A)/(18)` molecules