Question

State true or false.

Gas phase decomposition of N2O follows first order mechanism for low concentrations of N2O and second order mechanism for high concentrations of N2O.

(a) Gas phase decomposition of N2O follows first order mechanism for low concentrations of N2O and second order mechanism for high concentrations of N2O.

(b) True

(c) False

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I need to ask this question from Reducing the Size of Kinetic Models topic in division Elements of Reaction Kinetics of Chemical Reaction Engineering

Answer 1

The correct choice is (a) Gas phase decomposition of N2O follows first order mechanism for low concentrations of N2O and second order mechanism for high concentrations of N2O.

The explanation: The rate expression is, rN2 = \(\frac{k_1 NO_2^2}{1+kNO_2} \)

At low concentrations of N2O, kNO2 << 1 and the reactions follows second order. At high concentrations of N2O, kNO2 >> 1 and the reaction follows first order.