#### CHEMICAL FORUM

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 Posted: Sun Oct 08, 2017 4:44 pm    Post subject: Van’t Hoff equation and equilibrium concentration Hello, I got this assignment. Normal air (0.78% N2, 0.21% O2) is held at 2000K long enough to reach chemical equilibrium with NO and NO2. Assume that the only reactions involving NO and NO2 are: 1) N2 + O2 - 2NO 2) NO + 0.5O2 - NO2 The equilibrium constants obtained at 300K for the formation of NO and NO2 are: for 1) Keq:7 x 10^-31 for 2) Keq: 1.4 x 10^6 The standard heats of formation at 25ºC are: HfºN2 = 0, HfºO2 = 0, HfºNO = 90.25 kJ/mol, HfºNO2 =33.2 kJ/mol Please, could you help me about: point.a) Using Van’t Hoff equation, Calculate the concentrations of all components when equilibrium is reached at 2000K point.b) Plot the calculated equilibrium concentration of NO at two different oxygen contents of the reacting gas. Case 1 :78% nitrogen, 21% oxygen; and case 2: 78% nitrogen, 4% oxygen in a temperature range between 300 and 4000K Thank you
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