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For the gas phase decomposition of hydrogen iodide at 700 K 2 HI → H2 + I2 the average rate of disappearance of HI over the time period from t = 0 s to t = 963 s is found to be 3.99x10^-4 M s^-1. The average rate of formation of H2 over the same period is ____ M s^-1.