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Given the equation representing a system at equilibrium in a sealed, rigid container: N2(g) + O2(g)

Regents Chemistry Exam August 2022


44. Given the equation representing a system at equilibrium in a sealed, rigid container:

N2(g) + O2(g) + 182.6 kJ ⇌ 2NO(g)

When heat is added to the system, the concentration of N2(g) (1) decreases and the concentration of NO(g) decreases

(2) decreases and the concentration of NO(g) increases

(3) increases and the concentration of NO(g) increases

(4) increases and the concentration of NO(g) decreases


Explanation: This question tests our knowledge of Le Chatelier's principle. We see energy, 182.6 kJ on the reactant side (left). We can treat it as a reactant. When heat is added, there will be too much heat on the left side and to relieve this, the equilibrium will need to shift to the opposite side (right). If equilibrium shifts to the right, everything on the right will increase (concentration of NO) and everything on the left will decrease (concentration of N2)


Answer: 2


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