You have just landed on a new planet and are responsible for analyzing the compo

Question

You have just landed on a new planet and are responsible for analyzing the composition of the atmosphere. After collecting a sample of the atmosphere and analyzing it, you discover that the total atmospheric pressure is 540 mmHg. Using your knowledge of partial pressures, fill out the table below. Assume that the water vapor pressure is the same as on Earth. Match the numbers with their appropriate slots.

108 mmHg 0.15 mmHg 427 mmHg 119 mmHg 0 mmHg 24 mmHg 0.16 mmHg 0.17 mmHg 408 mmHg 446 mmHg 113 mmHg 47 mmHg Percentage of gas Atmospheric pressure: 540 mmHg Gas 25C, dry air 25C, 100% humidity Nitrogen (N2) Oxvg Carbon Dioxide (CO2 Water vapor 79% 21% 0.03% en (02

Explanation / Answer

when air is dry,

partial pressure = mole fraction* total pressures

partial pressures ( mm Hg): N2=0.79*540 =427, O2=0.21*540 = 113 , CO2=540*0.03/100 = 0.16 mHG

for 100% humid air, partial pressure of water vapor= vapor pressure of liquid at 25 deg.c

Antoine equation for water , log Psat(mmHg)= 8.07131- 1730.63/(t+233.426), t in deg.c

at 25 deg.c, log Psat( mm Hg)= 8.07131-1730.63/(25+233.426)

Psat= 23.8 mm Hg, partial pressure of water vapor =23.8 mm Hg

partial pressure of dry air ( when air is 100% humid)= 540-23.8= 516.2 mm Hg

partial presure (mm Hg)= partial pressure of component * mole fraction

partial pressures ( mm Hg): N2=0.79*516.2 =407.8 mm Hg , O2= 0.21* 516.2 =108.4 mm Hg, CO2=516.2*0.03/100 =0.15 mm Hg

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