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For the gas phase decomposition of phosphine at 120 °C 4 PH3(g)P4(g) + 6 H2(g) the...

For the gas phase decomposition of phosphine at 120 °C 4 PH3(g)P4(g) + 6 H2(g) the average rate of disappearance of PH3 over the time period from t = 0 s to t = 27 s is found to be 2.63×10-4 M s-1. The average rate of formation of H2 over the same time period is________ M s-1.

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