Bronze is an alloy made of copper (Cu) and tin (Sn). Calculate the mass of a bronze cylinder of radius 9.31 cm and length 36.28 cm. The composition of the bronze is 79.42 percent Cu and 20.58 percent. Sn and the densities of Cu and Sn are 8.94 g/cm3 and 7.31 g/cm3, respectively. What assumption should you make in this calculation? Enter your answer in scientific notation.

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