1.-Determine the mole fractions and partial pressures ofCO 2 , Ch 4 and He in a
ID: 76433 • Letter: 1
Question
1.-Determine the mole fractions and partial pressures ofCO2, Ch4 and He in a sample of gas thatcontains 0.250 mole of CO2, 1.29 moles ofCH4, and 3.51 moles of He, and in which the totalpressure is 5.78 atm. 2.- Determine the partial pressure and number of moles of eachgas in a 15.75 L vessel at 30.0 oC containing a mixtureof xenon and neon gases only. The total pressure in the vessel is6.50 atm, and the mole fraction of xenon is0.761. 1.-Determine the mole fractions and partial pressures ofCO2, Ch4 and He in a sample of gas thatcontains 0.250 mole of CO2, 1.29 moles ofCH4, and 3.51 moles of He, and in which the totalpressure is 5.78 atm. 2.- Determine the partial pressure and number of moles of eachgas in a 15.75 L vessel at 30.0 oC containing a mixtureof xenon and neon gases only. The total pressure in the vessel is6.50 atm, and the mole fraction of xenon is0.761.Explanation / Answer
To find the mole fraction: nt=nco2+nch4+nhe=0.250+1.29+3.51=5.05moles xi=ni/nt x=[0.050,0.255,0.695] Now the partial pressure according to the ideal gas law isexpressed: Pt=xiP xiP=[0.289,1.47,4.02]atm Now check: Pt=0.289+1.47+4.02=5.78atm 2-The partial pressures are found the same way: xiP=[Pxe,Pne]atm=[4.95,1.55]atm Now to find the number of moles in the container: ni=xiPV/RT=[3.13,0.984]mol Remember to choose the right gas constant and use the absolutetemperature when using the gas laws.
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