The molar mass of an unknown gas was measured by an effusion experiment. It was found that it took 63 s for the gas to effuse, whereas nitrogen gas (N2) required 48 s. The molar mass of the unknown gas is-

8.13 g/mol.

Explanation:

The following formula gives us the relationship between the effusion rates of two gases and their molar masses:

where x and y are respective sample gases and MM and rate are molar mass and rate of effusion respectively.

⇒

y= 14 /  = 8.13 g/mol.

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