`DNA` has density `1.1 g//mL`. And its molecular weight is `6xx10^(3) g//"mol"`. Average volume occupied by its single molecule will be :

Options

A. `9.1xx10^(-20) cc`
B. `9.1xx10^(-21) cc`
C. `9.8xx10^(-21) cc`
D. `9.6xx10^(-20) cc`

Answer

B

Explanation

`wt`. Of `1` molecule `=(6xx10^(3))/(6.02xx10^(23))`
volume occupied by its
`=("mass")/("density")=(6xx10^(3)//6.03xx10^(23))/(1.1)mL`
`=9.1xx1^(-21)cc`