Heating HI(g) at 425 degree C causes some of this compound to decompose, forming

Question

Heating HI(g) at 425 degree C causes some of this compound to decompose, forming H2(g) and I2(g). Eventually, the amounts of the three species do not change further; the system has reached equilibrium. (at this point, approximately 22% of the HI has decomposed.) Describe what is happening in this system at the molecular level.

Explanation / Answer

HI -->(1/2) H2 + (1/2) I2 let assume we have one mole of HI coefficient of decomposition = 0.22 [HI] = 1 - 0.22 [H2] = 0.11 [I2] = 0.11 Equillibrium constant = [H2]^(1/2) * [I2]^(1/2)/[HI] = (0.11)/(0.88) = 0.125 At molecular level there is a dynamic conversion of HI and H2 & I2

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