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The rate of effusion of a particular gas was measured and found to be 25.0 mL/min. Under the same conditions, the rate of effusion of pure methane (CH4) gas is 46.4 mL/min. What is the molar mass of the unknown gas?

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(rate1/rate2) = sqrt(M2/M1)
Solve for the one unknown.

55.1

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