For parts of the free response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate.
Dry air is comprised of N2, O2, and traces of other gases. A student obtains a 2.00 L container filled with a sample of dry air at a total pressure of 1.30 atm and a temperature of 295 K.
(a) Calculate the total number of moles of gas in the container.
(b) The student cools the gaseous mixture until either N2 or O, condenses. Which gas will condense first? Justify your answer in termsof the types and relative strengths of the intermolecular forces in N2 and 02.
(C) Using the legend given, draw at least three molecules of each type of gas in the sealed container represented below when one of the substances has condensed, but the other substance is still a gas.
(D)In this sample, 78% of the molecules are N2 and 21% of the molecules are O2. Calculate the total number of grams of the substance that condenses first.
