For the reaction N2 + 3H2 gives 2NH3, the equilibrium constant expression Kc is
Correct answer: C. [NH3]^2 divided by [N2][H2]^3
- A. [N2][H2]^3 divided by [NH3]^2
- B. [NH3] divided by [N2][H2]
- C. [NH3]^2 divided by [N2][H2]^3
- D. 2[NH3] divided by [N2] + 3[H2]
Explanation
Kc is written as the product concentrations over the reactant concentrations, each raised to the power of its coefficient in the balanced equation. Inverting the expression gives the equilibrium constant for the reverse reaction, which is why the first option is offered. Coefficients become exponents, never multipliers, which rules out the last option.
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About Reversible Reactions
A reversible reaction proceeds in both forward and backward directions, so reactants and products continue changing until dynamic equilibrium is established. The topic covers the meaning of equilibrium, the equality of forward and reverse rates, and how concentration, pressure and temperature disturb equilibrium, which is separate from the rate at which equilibrium is reached.
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