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##V = 3.31 * 10^(-29)”m”””^3##
All you really need to do here is plug the value of ##r## in the formula for the volume of the sphere and solve for ##V##.
Before doing that, convert the radius from picometers to meters
##199color(red)(cancel(color(black)(“pm”))) * “1 m”/(10^12color(red)(cancel(color(black)(“pm”)))) = 199 * 10^(-12)”m”##
The volume of the sphere – expressed in cubic meters – will be
##V = 4/3 * pi * r^3##
##V = 4/3 * pi * (199 * 10^(-12)”m”)””^3##
##V = 4/3 * pi * 7,880,599 * 10^(-36)”m”””^3##
##V = 33,101,176 * 10^(-36)”m”””^3##
Round this off to three , the number of sig figs you gave for the radius of the sphere, to get
##V = color(green)(3.31 * 10^(-29)”m”””^3)##
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