The number of gram molecules of oxygen in `6.02 xx 10^24` water molecules is ________ .

Options

A. 5 gram molecule
B. 2 gram of molecule
C. 1 gram of molecule
D. 0.5 gram of molecule

Answer

A

Explanation

Number of oxygen atoms in `6.02xx10^(24)` water molecules is `6.02xx10^(24)` `(H_2O` contains only one oxygen atom)
Number of oxygen molecule is
`(6.02xx10^(24))/(2) = 3.01 xx10^(24)`
`6.02 xx10^(23)` molecules
`-=` one gram molecules of oxygen
`therefore30.1 xx10^(23)` molecules
`-=` 5 gram molecules of oxygen