First slide

Gaseous state

Question

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

Moderate

A

$1 .0 mole of N_{2} at 560 K$
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

Solution

$u_{av} = \sqrt{\frac{8 RT}{πM}}$
$∴ u_{av} \propto \sqrt{\frac{T}{M}} but independent of number of moles.$

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