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For the gas phase decomposition of hydrogen iodide at 700 K

2 HIH₂ + I₂

the following data have been obtained:

[HI], M	1.45	0.809	0.561	0.429
time, s	0	7.58	15.2	22.7

The average rate of disappearance of HI over the time period from t = 7.58 s to t =15.2 s is  M s^-1.