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10. 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 closest to- A) 24 g/mol B) 37 g/mol C) 16 g/mol D) 32 g/mol E) 48 g/mol