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27 August, 09:55

Equal masses of 3 ideal gases x, y, z are mixed in a sealed rigid container. If the temperature of the system remains constant, which of the following statements about the partial pressure of gas X is correct?

A) It is equal to 1 / 3 the total pressure

B) It depends upon the intermolecular forces of attraction between molecules of X, Y and Z.

C) It depends on the relative molecular masses of X, Y and Z.

D) it depends on the average distance traveled between the molecular collisions

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Answers (1)
  1. 27 August, 10:55
    0
    C) It depends on the relative molecular masses of X, Y and Z.

    Explanation:

    Dalton's law for the partial pressure of an ideal gas in a mixture is given by the relationship:

    Pa = Xa Ptotal,

    where Xa is the mole fraction of gas A times the total pressure (Pa + Pb + Pc ...)

    The mole fraction is, in turn, given by

    Xa = mol A / total # moles

    Since the moles of a substance is the mass divided by its molecular weight, it follows that answer C) is the correct one.
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