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At 700 K , equilibrium constant for the ...

At 700 K , equilibrium constant for the reaction,`H_2(g) + I_2(g) hArr 2HI(g) ` is 54.8 if 0.5 mol `L^(-1)` of HI(g) is present at equilibrium at 700K,what are the concentration of`H_2(g) and I_2(g)` assuming that we initially started with HI(g) and allowed it to reach equilibrium at 700K?

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