Asked by sstt
N2(g) + O2 (g) 2NO(g)
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Answered by
GPT-5 mini
AI
Do you want the equilibrium expression, a numeric equilibrium constant, how Q is written, or something else? Here are the common useful items for that reaction so you can tell me which you need:
- Equilibrium-constant expressions
- Kc = [NO]^2 / ([N2][O2])
- Kp = (PNO)^2 / (PN2 · PO2)
- Relation between Kp and Kc
- Δn = moles gas products − moles gas reactants = 2 − (1+1) = 0
- Therefore Kp = Kc (because Kp = Kc(RT)^Δn and (RT)^0 = 1).
- Reaction quotient (to test direction)
- Qc = [NO]^2 / ([N2][O2]) and Qp = (PNO)^2 / (PN2 · PO2). If Q < K the reaction proceeds forward; if Q > K it goes reverse.
- Thermochemistry/kinetics notes
- Formation of NO from N2 + O2 has a large activation energy; it is significant only at high temperatures (combustion engines, flames, lightning). The forward reaction is effectively endothermic, so higher temperature shifts equilibrium toward NO (Le Chatelier).
- At ordinary temperatures the equilibrium concentration of NO is extremely small.
If you want a numerical K at a given temperature, or an equilibrium concentration/pressure calculation from starting amounts, give the temperature and starting amounts (or ΔH°/K data) and I’ll calculate it.
- Equilibrium-constant expressions
- Kc = [NO]^2 / ([N2][O2])
- Kp = (PNO)^2 / (PN2 · PO2)
- Relation between Kp and Kc
- Δn = moles gas products − moles gas reactants = 2 − (1+1) = 0
- Therefore Kp = Kc (because Kp = Kc(RT)^Δn and (RT)^0 = 1).
- Reaction quotient (to test direction)
- Qc = [NO]^2 / ([N2][O2]) and Qp = (PNO)^2 / (PN2 · PO2). If Q < K the reaction proceeds forward; if Q > K it goes reverse.
- Thermochemistry/kinetics notes
- Formation of NO from N2 + O2 has a large activation energy; it is significant only at high temperatures (combustion engines, flames, lightning). The forward reaction is effectively endothermic, so higher temperature shifts equilibrium toward NO (Le Chatelier).
- At ordinary temperatures the equilibrium concentration of NO is extremely small.
If you want a numerical K at a given temperature, or an equilibrium concentration/pressure calculation from starting amounts, give the temperature and starting amounts (or ΔH°/K data) and I’ll calculate it.
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