Question

A 295-mL flask contains pure helium at a pressure of 747 torr . A second flask with a volume of 480 mL contains pure argon at a pressure of 717 torr.

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

*P*He = ??? torr

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

*P*Ar = ??? torr

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

*P*total =?? torr

Answer #1

**first consider helium :**

**initially**

**pressure = 747**

**volume = 295 ml**

**now**

**both the flasks are connected**

**no reaction took place**

**so**

**amount of helium remians**

**also**

**the tempertaure is constant**

**but**

**the volume chages**

**final volume = 295 + 480**

**final volume = 775 ml**

**now**

**PV = nRT**

**at constant n and T**

**P1V1 = P2V2**

**so**

**747 x 295 = P2 x 775**

**P2 = 284.34**

**so**

**the new partial pressure of helium is 284.34
torr**

**b) similarly for Argon**

**P1V1 = P2V2**

**717 x 480 = P2 x 775**

**P2 = 444.08**

**so**

**the partial pressure of Argon is 444.08
torr**

**C)**

**now**

**total pressure = PHe + PAr**

**total pressure = 284.34 + 444.08**

**total pressure = 728.42**

**so**

**the total pressure is 728.42 torr**

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