Question: In an effusion experiment, 45 sec. was required for a certain number of moles of an unknown gas X to pass through a small opening

In an effusion experiment, 45 sec. was required for a certain number of moles of an unknown gas X to pass through a small opening into vacuum. Under the same conditions, it took 28 sec. for the same number of moles of Ar to effuse. Find the molar mass of unknown mass

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