Van’t Hoff equation and equilibrium concentration
Posted: Sun Oct 08, 2017 4:44 pm
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
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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