please solve and explain
It is a bit confusing what you are asking for. If you could type in the exact question that would be helpful. Then you would just need to work backward from the "units" of that answer. So suppose if they asked percentage of the earths surface in meters^2.
1 mole * 6.02x10^23 gumballs/per mole = (moles cancel and you get) 6.02x10^23 gumballs
6.022 x10^23 gumball x 0.001m^2/Gumballs (size of 1 gumball)= (gumballs cancel and you get) 6.02x10^20 m2
then you just put:
6.02x10^20 m^2 of gumballs/ suface area of the earth in m^2= (m^2 cancels and you get) a unitless number (which is what a fraction is) you then multiply by 100 to get a %.