10. Sketch a potential- energy diagram for the reaction of nitrous oxide N2O(g)

Question

10. Sketch a potential- energy diagram for the reaction of nitrous oxide N2O(g) - > N2(g) + O (g) The activation energy for the forward reaction is 251 KJ, the deltaH is + 167 kJ. What is the activation energy for the reverse reaction? Label you diagram appropriately. 11. In a series of experiments a reaction has rate-constant values of 9.3 x 10^-6/s at 350 K and 6.9 x 10^-4/s at 400 K. Calculate the activation energy for the reaction. 12. Excel Plot bromide decomposes at 10 degreeC via the reaction below I 2NOBr - > 2NO + Br2 Determine the overall order and the value of the rate constant by plotting the following data assuming first and then second order kinetics.

Explanation / Answer

question 11th answer

we know that activation energy 'Ea' is given by

Ea=(log K2- log K1)(2.303 xR)(T2.T1)/(T2-T1)

where K2=rate constant at temperature T2(6.9x10?-4/s at 400K)

         K1=rate constant at temperature T1 (9.3x10?-6/s at 350K)

         R=Universal gas constant =8.314 J/K/mol

substituting we get

Ea= (log 6.9x10?-4 -log 9.3x10?-6)(2.303 x8.3.4)(350 x400) /(400-350)

Ea=142058.21 J/mol

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