For H₂(g) + I₂(g) ⇌ 2HI(g), the equilibrium concentrations are = 0.10, = 0.10 and = 0.70 mol dm⁻³. What is Kc?
Correct answer C. 49
Explanation
Kc = [HI]² / ([H₂][I₂]) = (0.70)² / (0.10 × 0.10) = 0.49 / 0.010 = 49. It has no units because the moles of gas are equal on both sides.
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