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Q.

The average molecular speed is greatest in which of the following gas samples?

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a

1.0 mole of O2 at 560 K

b

0.50 mole of Ne at 500 K

c

0.20 mole of CO2 at 440 K

d

2.0 moles of He at 140 K

answer is D.

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Detailed Solution

u(av)=8RTπM,u(av)∝TM  But independent of number of moles  uO2∝56032=4.18⇒u(Ne)∝50020=5.0 uCO2∝44044=3.16⇒u(He)∝1404=5.92
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