3. A sample of gas contains 3 moles of argon and 5 moles of krypton. If the argon exerts a pressure of

210 torr , what is the pressure of the krypton? What is the total pressure?

pressure of the krypton = 350torr,Total pressure= 560torr

Explanation:

Note:The partial pressure of an individual gas = to the total pressure multiplied by the mole fraction of that gas.

Given

Argon=3moles    

pressure for Argon  =PAr= 210 torr

Krpton  = 5 , Kr pressure = ?

a) PArgon  = mole fraction of Argon  x total pressure

  3/3+5 x total pressure = 210

total pressure = 210x 8/3

Total pressure= 560torr

b) pressure for Krypton = Krypton mole fraction x total pressure

                                   5/8 X 560

                            = 350torr

pressure of the krypton = 350torr

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