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Olympic cyclists fill their tires with helium to make them lighter. Assume that the volume of the tire is 855mL , that it is filled to a total pressure of 120psi , and that the temperature is 23 C. Also, assume an average molar mass for air of 28.8 g/mol. Part A: Calculate the mass of air in an air-filled tire. Part B: Calculate the mass of helium in a helium-filled tire. Part C: What is the mass difference between the two?

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