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Given an equation representing a system at equilibrium:2SO2(g) + O2(g) ⇌ 2SO3(g) + energyWhich change occurs when the temperature is increased?

Regents Chemistry Exam August 2024 Question 40


40 Given an equation representing a system at equilibrium:

2SO2(g) + O2(g) 2SO3(g) + energy

Which change occurs when the temperature is increased?

(1) The equilibrium shifts to the left and the concentration of SO3(g) decreases.

(2) The equilibrium shifts to the left and the concentration of SO3(g) increases.

(3) The equilibrium shifts to the right and the concentration of SO3(g) decreases.

(4) The equilibrium shifts to the right and the concentration of SO3(g) increases



Solution:

This question tests our knowledge of Le Chatelier's principle. We see energy is on the product side (right). We can treat it as a product. When temperature is increased (heat is added), there will be too much heat on the right side and to relieve this, the equilibrium will need to shift to the opposite side (left). If equilibrium shifts to the left, everything on the left will increase and everything on the right will decrease . Choice 1 is the correct answer.


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