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For the gas phase decomposition of hydrogen iodide at 700 K 2HI(g) -> H2(g) + I2(g) the average rate of disappearance of HI over the time period from t = 0s to t = 655s is found to be 6.06 x 10^-4 M/s. What is the average rate of appearance of H2 over the same time period? ___ M/s