First slide

Gaseous state

Question

A 100 mL flask contained H₂ at 200 torr, and a 200 mL flask contained He at 100 torr. The two flask were, then connected so that each gas filled their combined volume. Assuming no change in temperature, total pressure is

Moderate

A

300 torr
B

66.66 torr
C

150 torr
D

133.33 torr

Solution

$n_{H_{2}} = \frac{pV}{RT} = \frac{20000}{RT}, n_{He} = \frac{pV}{RT} = \frac{20000}{RT}$
$∴ n_{H_{2}} + n_{He} = \frac{40000}{R T} Total volume = 300 mL p = \frac{n}{V} R T = \frac{40000 R T}{R T \times 300} = \frac{400}{3} = 133.33 torr$

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