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**Assume that [tex]30.0 cm^3[/tex] of gasoline is atomized into N spherical droplets, each with a radius of [tex]2.00\times 10^{-5} m[/tex]. What is the total surface area of these N spherical droplets?**

How do I find the number of gasoline molecules in a given amount of liquid, when I have the size of the radius??

Thank you