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Equilibrium & Le Chatelier

N2O4(g)⇌2NO2(g)α=0.23N_2O_4(g) \rightleftharpoons 2NO_2(g) \qquad \alpha = 0.23
Temperature25 °C
Pressure1.00 atm
Degree of dissociation (α)0.23
NO₂ mole fraction37%
Total moles of gas (per mol N₂O₄ started)1.23
  • Heat it up until the gas is mostly NO₂ (more than 70% NO₂ by moles)
  • Cool it and raise the pressure until the gas is almost colourless (under 10% NO₂)
  • Find a temperature and pressure where the mixture is almost exactly half NO₂, half N₂O₄
  • Above 75°C, raise the pressure enough to pull the mixture back under 50% NO₂ — proof pressure and temperature pull in opposite directions