Chemistry

Problem

At 1000 K a gaseous mixture reaches equilibrium for the reaction

2\,\text{SO}_2(g)+\text{O}_2(g)\rightleftharpoons 2\,\text{SO}_3(g).

The equilibrium concentrations are

[\text{SO}_2]=0.20\,\text{M}

[\text{O}_2]=0.10\,\text{M}

, and

[\text{SO}_3]=0.30\,\text{M}

. What is the value of

K_c

for this reaction at 1000 K? a)

0.044

45

23

15

Intuitive explanation

The equilibrium constant $K_c$ measures how far a reaction has shifted toward products at a given temperature. To find it, you substitute the equilibrium concentrations directly into the expression built from the balanced equation—products over reactants, each raised to their stoichiometric coefficients. This single calculation captures the entire balance point of the system at 1000 K.

Intuitive explanation

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