First slide

Gaseous state

Question

X mL of H₂ gas effuse through a hole in a container in 5 s. The time taken for the effusion of the same volume of the gas specified below under ideal conditions is

Moderate

A

10 s : He
B

20 s : O₂
C

25 s : CO
D

55 s : CO₂

Solution

$(b) \frac{R_{1}}{R_{2}} = \frac{t_{1}}{\frac{V}{t_{2}}} = \frac{t_{2}}{t_{1}} = \sqrt{\frac{M_{2}}{M_{1}}}$
$(a) \frac{10}{5} = \sqrt{\frac{4}{2}} = \sqrt{2} : false (b) \frac{20}{5} = \sqrt{\frac{32}{2}} = 4, true$

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