The decomposition of phosphine gas (PH3), is a first order process with respect to the concentration of PH3. The rate constant for the reaction is 4.87×10–3 s–1 at 65.0°C? 4 PH3 (g) → P4 (s) + 6 H2 (g) i. A container is filled with PH3 gas to an initial concentration of 0.275 mol/L. What will the concentration of PH3 be after 10.0 minutes? ii. The activation energy for the reaction is 104 kJ/mol. Calculate the value of the rate constant for the decomposition of PH3 at 80.0°C.

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