H has two natural isotopes fo `_1 H^_1` and (O) has two isotopes ` O^(16)` and ` O^(18)` Which of the following mol . Wt , o f ` H_(2) O` will not be possible ?

Options

A. `19`
B. `20`
C. `24`
D. `22`

Answer

C

Explanation

Possible mol wt may be ` 18, 20, 19, 20, 22, 21`, repectively for ` H^(1) H^(1) O^(16)` , `H^2 H^2 O^(16) ,H^(1) H^(2) O^(16) , H^(1) H^(1) O^(18) , H^(2) H^(2) o^(18) ,H^(1) H^(2) O^(18)`.