Problem: Olympic cyclists fill their tires with helium to make them lighter. Assume that the volume of the tire is 860 mL , that it is filled to a total pressure of 125 psi , and that the temperature is 25 oC. Also, assume an average molar mass for air of 28.8 g/mol.Calculate the mass of helium in a helium-filled tire.

FREE Expert Solution

PV=nRT

PVRT=nRTRTn=PVRT=(125 psi×1 atm14.7 psi)(860 mL×10-3 L1 mL)(0.08206 L·atmmol·K)(25+273.15)K

n = 0.299 mol

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Problem Details

Olympic cyclists fill their tires with helium to make them lighter. Assume that the volume of the tire is 860 mL , that it is filled to a total pressure of 125 psi , and that the temperature is 25 oC. Also, assume an average molar mass for air of 28.8 g/mol.

Calculate the mass of helium in a helium-filled tire.

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