We are being asked to determine which of the given conditions must be true for the reaction:
2 SO2(g) + O2(g) ⇌ 2 SO3(g)
When dealing with equilibrium and Kc:
• Kc → equilibrium units are in molarity
• Kc is an equilibrium expression:
▪ only aqueous and gaseous species are included in the equilibrium expression
▪ the coefficient of each compound in the reaction equation will be the exponent of the concentrations in the equilibrium expression
Since the container is only 1 L, the mole values of each will equal the initial concentration:
2SO2(g) + O2(g) ⇌ 2SO3(g)
Suppose 0.10 mol of SO2 and 0.10 mol of O2 are added to a 1-L vessel. At equilibrium, which of the following conditions must be true?
A) [O2] = 2[SO3]
B) [SO2] = [O2]
C) [SO2] > [O2]
D) [SO2] < [O2]
E) [SO2] = [O2] = [SO3]
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