For the gas phase decomposition of phosphine at 120 °C 4 PH3(g)P4(g) + 6 H2(g) the following data have been obtained: [PH3], M 3.62x10-2 2.19x10-2 1.32x10-2 7.98x10-3 time, s 28.0 56.0 84.0 The average rate of disappearance of PH3 over the time period from t = 56.0 s tot = 84.0 s is || Msl.

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