A 250-Mol Sample of HI Is Placed in a 1 $\times$

question 71

Multiple Choice

A 2.50-mol sample of HI is placed in a 1.00-L vessel at 460°C,and the reaction system is allowed to come to equilibrium.The HI partially decomposes,forming 0.191 mol H₂ and 0.191 mol I₂ at equilibrium.What is the equilibrium constant K_c for the following reaction at 460°C?
½ H₂(g) + ½ I₂(g) HI(g)

• A) 1.23 \(\times\) 10²
• B) 8.10 \(\times\) 10^-3
• C) 1.72 \(\times\) 10^-2
• D) 11.1
• E) 7.63

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