Reversible Reactions and Equilibrium — Quiz

Question 6 • Chemistry

Consider the general reversible reaction. A cap A plus b cap b long left right arrow c cap c plus d cap d What is the equilibrium constant expression for the given system?

Answer

cap k sub e q is equal to the fraction with numerator cap c times cap d and denominator cap A times cap b

cap k sub e q is equal to the fraction with numerator cap c to the c th power times cap d to the d th power and denominator cap A to the A th power times cap b to the b th power

cap k sub e q is equal to the fraction with numerator c cap c d cap d and denominator A cap A b cap b

cap k sub e q is equal to the fraction with numerator cap A to the A th power times cap b to the b th power and denominator cap c to the c th power times cap d to the d th power

Explanation

For a reaction aA + bB ⇌ cC + dD, the equilibrium constant is products over reactants, with each concentration raised to its stoichiometric coefficient. Thus, Kₑq = [C]^c[D]^d / ([A]^a[B]^b), which matches the expression in choice B.

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