Find the equilibrium constant (Kc) at 500 K for:
2HI(g) ⇌ H₂(g) + I₂(g)
given that:
½H₂(g) + ½I₂(g) ⇌ HI(g), Kc = 5
1. 0.04
2. 0.4
3. 25
4. 2.5
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