At 333 K, which of the pairs of gases below would have the most nearly identical rates of effusion?

Name: At 333 K, which of the pairs of gases below would have the most nearly identical rates of effusion?
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The rate of effusion of a gas is inversely proportional to the square root of its molar mass. CO and N2 have very similar molar masses (28.01 g/mol for CO and 28.02 g/mol for N2), leading to nearly identical rates of effusion.

At 333 K, Which of the Pairs of Gases Below