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The value of the equilibrium constant K ...

The value of the equilibrium constant K for the reaction `H_2(g) +I_2(g) hArr 2Hl(g) " is " 48 " at " 717 K.`
Find out the value of K for the following reaction at
` Hl(g) hArr (1)/(2) H_2(g) + (1)/(2) I_2(g)`

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