thefandomarmy24
08.11.2019 •
Chemistry
Amixture of methane gas, ch4(g) , and pentane gas, c5h12(g) , has a pressure of 0.5799 atm when placed in a sealed container. the complete combustion of the mixture to carbon dioxide gas, co2(g) , and water vapor, h2o(g) , was achieved by adding exactly enough oxygen gas, o2(g) , to the container. the pressure of the product mixture in the sealed container is 2.378 atm . calculate the mole fraction of methane in the initial mixture, assuming the temperature and volume remain constant.
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Ответ:
Mole fraction of methane is 0,8624
Explanation:
The complete combustion of methane gas and pentane gas is:
CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)
C₅H₁₂(g) + 8O₂(g) → 5CO₂(g) + 6H₂O(g)
The initial pressure is 0,5799atm, that is the sum of partial pressures of methane and pentane gases:
0,5799atm = x + y (1)
Where x is partial pressure of methane and y is partial pressure of pentane.
As x moles of methane produce x moles of CO₂ and 2x moles of H₂O and y moles of pentane produce 5y moles of CO₂ and 6y moles of H₂O, it is possible to write:
2,378atm = x + 2x + 5y + 6y
2,378atm = 3x + 11y (2)
Now, replacing (1) in (2):
2,378atm = 1,7397atm - 3y + 11y
0,6383atm = 8y
y = 0,0798 atm
x = 0,5001 atm
The partial pressure of methane over total initial pressure will be the mole fraction of methane:
= 0,8624
I hope it helps!
Ответ: