Question

Kinetics For H2 +I2 ->2HI 103k (1/0Cs)      0.54               2.5               &

Kinetics

For H2 +I2 ->2HI

103k (1/0Cs)      0.54               2.5                   14                    25                    64

T (K)               599                  629                  666                  683                  700

Find Ea and A

Homework Answers

Answer #1

from the data take first two rate constant values and first two temperatures.

when two tempareture are given the Arrehenius equation

K1-------------- rate constant at T1 temperature (low T) = 0.54

K2-------------- rate constant at T2 temperature (high T) = 2.5

T1= 599K

T2=629K

log(k2/k1) =( Ea/2.303R)[1/T1-1/T2]

     log (2.5/0.54) =( Ea/2.303x 8.314 x10^-3)[1/599-1/629]

Ea= 160 kJ/mol

another equation

K= A . e ^-Ea/RT

take first rate constant and temperature

0.54 = A . e ^-160/8.314 x10^-3 x599

A= 4.87 x1013

A= 4.87 x1013 rate constant units

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