For the gas phase decomposition of phosphine at 120 °C 4 PH3(g) → P4(g) + 6 H(g) the average rate of disappearance of PH3 over the time period from t = 0 s to t = 24.5 s is found to be 1.27x10 3 M/: What is the average rate of appearance of H2 over the same time period? M/s.

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