Reaction Equilibrium Extent Calculator
Solve ideal concentration equilibrium for the fixed stoichiometry A+B ⇌ C+D with nonnegative species balances.
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Result
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Calculation steps
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How to calculate
Bound the reversible extent by available reactants/products and solve the monotone log reaction quotient.
Aeq=A0−ξ; Beq=B0−ξ; Ceq=C0+ξ; Deq=D0+ξ; Kc=Ceq Deq/(Aeq Beq)
Worked example
A0=B0=1, C0=D0=0 and Kc=4 give forward extent 2/3 mol/L, leaving A=B=1/3 and C=D=2/3.
Assumptions and input details
Fixed 1:1:1:1 stoichiometry, constant volume and ideal concentration equilibrium. No reaction identity, kinetics, activity correction or changing phase/volume. Positive extent is forward; a missing bidirectional extent interval is rejected.
Using this calculator
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Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
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