Question

the radius of hydrogen atom is approximately 40 pm. what will be it's value in mm​

Answer 1

Volume of 1 hydrogen atom, V=4πr

3

/3;r=0.5×10

−10

m

So, V=0.5245×10

−30

m

3

So, volume of 1 mole (6.02×10

23

) is V×6.02×10

23

=3.157×10

−7

m

3

So, order of magnitude is 10

−7

m

3

.