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The rate of the reaction H2 + I2 to 2HI ...

The rate of the reaction `H_2 + I_2 to 2HI " is given by" :^(**"**)`
Rate = `1*7 xx 10^(-19) [H_2][I_2] " at " 25^@C`
The rate of decomposition of gaseous `2HI to H_2 and I_2` is given by :
Rate `= 2*4 xx 10^(-21) [H_2][I_2] " at " 25^@C`.
Calculate the equilibrium constant for the formation of HI from `H_2 and I_2 " at " 25^@C`.

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