If the two flasks are connected through a stopcock and the stopcock is opened, w
ID: 574582 • Letter: I
Question
If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of helium?P_He: ?
If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of argon?P_Ar: ?
If the two flasks are connected through a stopcock and the stopcock is opened, what is the total pressure?
P_total: ?
A 285-mL flask contains pure helium at a pressure of 755 torr. A second flask with a volume of 495 mL contains pure argon at a pressure of 713 torrExplanation / Answer
total volume = 285 + 495 = 780 mL
for Helium :
P1 = 755 torr ; V1 = 285 mL
P2 = ?? ; V2 = 780 mL
P2 = P1 x V1 / V2
= 755 x 285 / 780
P2 = 276 torr
pressure of He = 276 torr
for Argon :
P2 = 713 x 495 / 780
= 452.5
pressure of Ar = 452 torr
Ptotal = 728 torr