A 260-mL flask contains pure helium at a pressure of 755 torr . A second flask w

Question

A 260-mL flask contains pure helium at a pressure of 755 torr . A second flask with a volume of 460 mL contains pure argon at a pressure of 716 torr.

A) If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of helium?

B) If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of argon?

C) If the two flasks are connected through a stopcock and the stopcock is opened, what is the total pressure?

Explanation / Answer

A ) partial pressure of helium (pHe) =

        P1V1 =P2V2

    260*755 = (260+460)*P2

P2 = 272.64 torr .

B)   partial pressure of helium (pAr) =

        P1V1 =P2V2

    460*716 = (260+460)*P2

P2 = 457.44 torr .

c) Total pressure = 457.44+272.64 = 730.08 torr

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