At 298 K, which of the following gases has the lowest average molecular speed?

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CO2 at 0.20atm

He at 0.40 atm

CH4 at 0.80atm

NO at 1.00 atm

answer is A.

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Detailed Solution

uav=8pVπM u∝pM=0.2044=0.067 for CO2 =0.404=0.32 for He =0.8016=0.22 for CH4 =130=0.18 for NO

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