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For the gas phase decomposition of phosphine at 120 C 4 PH3(9)P4(9) + 6 H2(9) the following data have been obtained: (PH3), M time, s

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For the gas phase decomposition of phosphine at 120 C 4 PH3(9)P4(9) + 6 H2(9) the following data have been obtained: (PH3), M time, s 5.40x10-2 0 3.15x10-2 30.0 1.83x10-2 60.0 1.07x10-2 90.0 The average rate of disappearance of PHz over the time period from t = 60.0 s to t = 90.0 s is Ms 1

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