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A proton, which is the nucleus of a hydrogen atom, can be modeled as a sphere with a diameter of 2.4 fm and a mass of 1.67 x 10-27 kg. Densities of Some Common Substances at Standard Temperature (0C) and Pressure (Atmospheric) Substance Air Air (at 20C and atmospheric pressure) Aluminum Benzene Brass Copper Ethyl alcohol Fresh water Glycerin Gold Helium gas Hydrogen gas Ice (a) Determine the density of the proton. kg/m p (kg/m) 1.29 1.20 2.70 10 0.879 10 8.4 X 10 8.92 x 10 0.806 10 1.00 10 1.26 X 10 19.3 X 10 1.79 X 10-1 8.99 10- 0.917 x 10 Substance Iron Lead Mercury Nitrogen gas Oak Osmium Oxygen gas Pine Platinum Seawater Silver Tin Uranium P (kg/m) 7.86 x 10 11.3 x 10 13.6 10 1.25 0.710 10 22.6 10 1.43 0.373 x 108 21.4 x 10 1.03 10 10.5 10 7.30 X 10 19.1 x 10 (b) State how your answer to part (a) compares with the density of aluminum, given the table above. less than aluminum equal to aluminum greater than aluminum.