Question

A 275-mL flask contains pure helium at a pressure of 743 torr . A second flask with a volume of 470 mL contains pure argon at a pressure of 731 torr.

part a: If we connect the two flasks through a stopcock and we open the stopcock, what is the partial pressure of helium? Express the partial pressure in torr to three significant figures.

part b: If we connect the two flasks through a stopcock and we open the stopcock, what is the partial pressure of argon? Express the partial pressure in torr to three significant figures.

Part C: If we connect the two flasks through a stopcock and we open the stopcock, what is the total pressure? Express the total pressure in torr to three significant figures.

Answer 1

Volume of He. V = 275 ml. Pressure of He, Pie 2 793 torr Volume of Ar. Var 470 ml Pressure of Ar Para 731 torr. Now, total volume when two flash is Connected through a stopcoch = (275+470) and. = 745 me. - Veot. As the temperature is constant we can use [ Pue a partial pressure , of He 9 > Pire Vie = b Vt P a Phe Vite 2) Pue ? Vista b Pressure of Ar 1 743 x 275 torr 795 7 2.79.26 took h 274 toir Pari Var Pivot Pa Pasticul 2) PA PA VAN 731 x 470 745 tory 2 461-17 toro ~ 461 torr total Pressure, Ptot a Par The (941.17 + 274.26) torr 2 735.43 toon ² 735 torr. -