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At 700K equilibrium constant for the rea...

At `700K` equilibrium constant for the reaction :
`H_(2)(g) +I_(2)(g)hArr2HI(g)` is `54.8`. If `0.5mol^(-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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