engineering chemistry MCQ #2179

For the reaction 2NO ⇌ N2 + O2, if the initial concentration of NO is 2M and it dissociates by 20%, what is the value of Kc?

engineering chemistry MCQ #2179

  1. Question 1

    Q1. For the reaction 2NO ⇌ N2 + O2, if the initial concentration of NO is 2M and it dissociates by 20%, what is the value of Kc?

    • A) 0.0625
    • B) 0.125
    • C) 0.25
    • D) 0.5

    Answer: 0.0625

    Explanation: Kc = [N2][O2] / [NO]²; after 20% dissociation, [NO] = 1.6, [N2] = 0.2, [O2] = 0.2, so Kc = (0.2 * 0.2) / (1.6)² = 0.0625 / 2.56 = 0.015625 * 4 = 0.0625.