1. The problem statement, all variables and given/known data The Earth is about 12.70 km in diameter. The Earth’s average density is about 5.5 grams cubic centimeter. A nucleon (the main constituent of an atomic nucleus) has a mass of about 1.67 x 10⁻²⁷ kilograms. If the Earth’s mass is entirely due to its nucleons, how many nucleons are in the Earth? 2. Relevant equations Volume = 4/3pi*r3 3. The attempt at a solution radius =6350m volume = 4/3pi*(6350)3 = 1.07 *1012 density =5.5g/cm3 =5500kg/m3 Earth's mass = density*volume =5500kg/m3 * 1.07 *1012 =5.899 *1015 kg number of nucleons= 5.899 *1015 kg / 1.67 x 10⁻²⁷ = 3.53 * 1042 This answer is wrong but why is it wrong?