Answer:
![K=([D]^d[C]^c)/([B]^b[A]^a)](https://img.qammunity.org/2020/formulas/chemistry/middle-school/9vxwyxyo2eqand2nevhha93wcss3y657ay.png)
Step-by-step explanation:
Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as
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
The expression for
for the given reaction is written as:
![K=([D]^d[C]^c)/([B]^b[A]^a)](https://img.qammunity.org/2020/formulas/chemistry/middle-school/9vxwyxyo2eqand2nevhha93wcss3y657ay.png)
where a, b , c and d are respective stoichiometric coefficients for A, B, C and D.