The rate of decomposition of PH3 was studied at 941.00 °C. The rate constant was found to be 0.0645 s-¹. 4PH3 P4 + 6H₂ 1st attempt il See Periodic Table If the reaction is begun with an initial PH3 concentration of 0.95 M, what will be the concentration of PH3 after 21.00 s? M See Hint

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