Question

2) Given the partial pressure of 3 gases in a container of a given volume and temperature, what is the total pressure in the same units? What is the mole fraction of one of the specific gases? If the total pressure were changed, what would the new value for partial pressure of one of the gases (different from the gas asked in the previous part)? What is the value for the new volume?

What is this asking?

Answer 1

They are asking us what is total pressure when partial pressure of each gas is provided. Here we go with Dalton's law of partial pressure

P_Total = P₁ + P₂ + P₃

P_Total = Total pressure of 3 gases,

P₁ = partial pressure of gas 1,

P₂ = partial pressure of gas 2,

P₃ = partial pressure of gas 3

Units should be same of partial pressure of gases units like atm, mmHg, torr, Pa, kPa, bar any one used in previous part.

last two questions require previous part to answer, which is not posted by you, but we can calculate this third part only as (suppose that one of the gas is P₃, say)

P₃ = P_Total - P₁ - P₂

The new volume can be calculated by V2 = (P1V1 / P2)

P1 = initial pressure; V1 = initial volume; P2 = new pressure; V2 = new volume.

Hope this helped you!

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