(Answered) 1 the average molecular speed in a sample ofnbspnbspxe gas

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1) The average molecular speed in a sample of XE gas at a certain temperature is 212 m/s.

The average molecular speed in a sample of HE gas is _____________m/s at the same temperature

1b) A sample of NE gas is observed to effuse through a pourous barrier in 6.15 minutes. Under the same conditions, the same number of moles of an unknown gas requires 7.58 minutes to effuse through the same barrier.

The molar mass of the unknown gas is ____________ g/mol.

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