First slide

Gaseous state

Question

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

Moderate

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

Solution

$u (av) = \sqrt{\frac{8 RT}{πM}}, u (av) \propto \sqrt{\frac{T}{M}} But independent of number of moles u (O_{2}) \propto \sqrt{\frac{560}{32}} = 4 .18 \Rightarrow u (Ne) \propto \sqrt{\frac{500}{20}} = 5 .0 u ({CO}_{2}) \propto \sqrt{\frac{440}{44}} = 3 .16 \Rightarrow u (He) \propto \sqrt{\frac{140}{4}} = 5 .92$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App