Explain how the rate of diffusion of a gas is related to its molar mass. Carbon dioxide gas (CO2) effuses 3.2 times faster than an unknown gas. Determine the molar mass of the unknown gas. Show your work or explain your answer, giving specific values used to determine the answer.

Relative rates of effusion (on p. 366 in Chemistry3)

Calculate the relative rates of effusion of oxygen, carbon dioxide, and

nitrogen through a porous film at a fixed temperature.

Strategy

Use Equation 8.21, which shows how the relative rates of effusion depend

upon the molar mass of the molecules

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a polar bond is formed when electrons are shared unevenly between atoms

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