One Mole of SO₂ , Two Moles of O₂, and Two

question 67

Multiple Choice

One mole of SO₂ , two moles of O₂, and two moles of SO₃ are placed in a 1.0 liter flask. If K c for the reaction 2 SO₂ (g) + O₂(g) 2 SO₃(g) is 0.50 at this temperature, what occurs in the flask as equilibrium is approached?

• A) [SO₃] increases
• B) [O₂] increases
• C) [SO₂] decreases
• D) No reaction occurs since the system is at equilibrium.
• E) The equilibrium concentrations of [O₂] and [SO₂] are very small.

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