How many molecule are present in one `mL` of water vapour of `STP` ?

Options

A. 1
B. 1000
C. `2.69 xx 10^(19)`
D. `6.02 xx 10^(20)`

Answer

C

Explanation

22400 mL of water contain molecules
`=6.022 xx 10^(23)`
1 mL of water contains molecules.
`=(6.022 xx 10^(23))/22400 = 2.69 xx 10^(19)`