First slide

Gaseous state

Question

The ratio of average speeds of oxygen at 27°C and 127°C is

Moderate

A

1.15
B

0.95
C

0.866
D

0.75

Solution

$We have ratio = \frac{\sqrt{2 {RT}_{1} / M}}{\sqrt{2 {RT}_{2} / M}} = \sqrt{\frac{T_{1}}{T_{2}}} = \sqrt{\frac{300 K}{400 K}} = 0 .866$

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