5 thethermaldeco mposit

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Unformatted text preview: l deco mposit ion of N2O5 to form NO2 and O2 is a first order reaction. – The rate constant for the reaction is 5.1x10 4 s–1 at 318 K. Calculate the half­life of this react ion. 5. The thermal deco mposit ion of phosphine (PH3) to phosphorus and hydrogen gas is a first order reaction, with a half­life o f 35 s at 680°C. a) Calculate the rate constant for this react ion. b) Calculate the time required for 95% of phosphine to decompose. n 6. The rate constant for the 2 d order reaction shown below is 0.54 M–1 at 300°C. How many seconds would it take for the concentration of NO2 to decrease fro m 0.62 M to 0.28 M? 3 7. The gas phase deco mposit ion of NO2 to form NO and O2 was studied at 383°C and the fo llowing data was collected: Time (s) 0.0 5.0 10.0 15.0 20.0 [NO2], M 0.100 0.017 0.0090 0.0062 0.0047 Determine the order of this react ion with respect to [NO2] and calculate the rate constant. 8. The reaction 2 N2O5 ® 4 NO2 + O2 has an act ivatio n energy o f 100 kJ/mo l and an enthalpy o f –23 kj/mo l. Sketch a potential energy diagram for this reaction and determine the act ivat ion energy for the reverse reaction? 4 9. Th...
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