ProblemSet_2_Fall2008

# ProblemSet_2_Fall2008 - CHEM 3615 Problem Set#2 Ideal and...

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Page 1 of 2 CHEM 3615 Problem Set #2 – Ideal and Real Gases Due September 9, 2008 Read Chapter 1, the Handout on the Barometric Distribution Law & Chapter 6 (Sections 6.1 and 6.2) regarding the phase rule. Problems 1 through 6 are due at the start of class and will be graded. 1. Show that ρ = ρ z RT Mg exp o and = z RT Mg exp c ~ c ~ o are valid expressions for the barometric distribution law, = z RT Mg exp p p o (recall this problem assumes ideal gas behavior). 2. The approximate sea level (1 atm) composition of the atmosphere is N 2 = 78.09%, O 2 =20.93%, Ar=0.93%, CO 2 =0.03%, Ne=0.0018% and He=0.0005% (all % values are mole%). Compute the partial pressures (in atm), the total pressure (in atm) and the composition of the atmosphere in mole fractions at altitudes of 6.2 km (Mount McKinley) and 160 km (approximate lowest value for a low earth orbit) assuming constant temperature (25°C) with g = 9.807 m/s 2 and ideal gas behavior. 3. Using a computer, generate graphs of p/p o vs. z and ln(p/p o ) vs. z (x-axis ranges of 0 to 50 km) for T = 300K and 1000K (both temperatures should be plotted on the same graph, clearly labeled) assuming the gas is N 2 and obeys the barometric distribution law and g = 9.807 m/s 2 . For 300K, plot p/p

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ProblemSet_2_Fall2008 - CHEM 3615 Problem Set#2 Ideal and...

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