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A 1.00 L flask is filled with 1.25 g of argon at 25 ∘C. A sample of ethane vapor is added to the same flask until the total pressure is 1.450 atm.

A) What is the partial pressure of argon, PAr, in the flask?
B) What is the partial pressure of ethane, Pethane, in the flask?

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This is the answer for what is the partial pressure of argon, par, in the flask?

Part A
We first need to calculate the number of moles of Argon

what is the partial pressure of argon, par, in the flask?

We will use the ideal gas law to determine the partial pressure of Argon from
PV = nRT
P(1) = 0.031(0.0821) (25 + 273)
P = 0.75 atm


Part B
The partial pressure of ethane can be found by subtracting the pressure found in Part A for Argon from the total Pressure
Pe = P total – Pa
Pe = 1.45 – 0.75
Pe = 0.7 atm

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