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 3.16x10-2 1.84x10-2 1.07x10-2 6.25x10-3 time, s 0 30.0 60.0 90.0 The average rate of disappearance of PH3 over the time period from t = 0 s to t = 30.0 s is ______ M s-1.

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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 3.16x10-2 1.84x10-2 1.07x10-2 6.25x10-3
time, s 0 30.0 60.0 90.0


The average rate of disappearance of PH3 over the time period from t = 0 s to t = 30.0 s is ______ M s-1.

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