A 255-mL flask contains pure helium at a pressure of 757 torr . A second flask w

Question

A 255-mL flask contains pure helium at a pressure of 757 torr . A second flask with a volume of 490 mL contains pure argon at a pressure of 716 torr.

PART A

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

PART B

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

PART C

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

Explanation / Answer

Total volume : 255 mL + 490 mL = 745 mL

Partial pressure of helium

757 torr (255 mL / 745 mL)

= 259.1 torr for He

Partial pressure of Argon

716 torr (490 mL / 745 mL)

= 470.9 torr for Ar

Total pressure

259.1 torr + 470.9 torr = 730 torr

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