Question

A 270-mL flask contains pure helium at a pressure of 751 torr . A second flask with a volume of 485 mL contains pure argon at a pressure of 718 torr .

Express all three answers to 3 significant figures.

Part A:

If we connect the two flasks through a stopcock and we open the stopcock, what is the partial pressure of helium?

PHe=______torr

Part B:

If we connect the two flasks through a stopcock and we open the stopcock, what is the partial pressure of argon?

PAr=_______torr

Part C:

If we connect the two flasks through a stopcock and we open the stopcock, what is the total pressure?

Ptotal=______torr

Answer 1

Curinn solution) delium Angon. Ven 485 m2 Va Q70m2 P2 = 71stou. Bia tsitou. 755m total alth a moly of He > PV = nRT 1270m2 21 751 tous "He - RTL Gistou) Carsmi) Pak Angon = RT moly of RT Total= te Ah Protal = "Total RT total RT - Inhedral) XRT Rotal : urodal 755m Protala (270x751 ) + ( 718 ) (485) agot BT X 755mL ñ 72908 toru. I of the Hotal = Moltraction Potal & Pite=

moles of the The (mole fraction of He) = Moles of Hedmoles of the : 270x750) Ri (2707x701) + (718)1985) RT 202770 201 551000 0.368 ore 729.8 *0.368) Frostial Pressur 268.56700 of he (418) x (485) NYI mole traction of Ax= Similarly (2.70) *701 +(74871400) = 0,632 moles partial pursue of Angon. Then = - (729.8) X 0.632 mely 461.23 Tou) h