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Q.

The rate constant for two parallel reactions were found to be 1.0×10-2dm3 mol-1 s-1 and 3.0×10-2 dm3 mol-1 s-1If the corresponding energies of activation of the parallel reactions are 60.0 kJ mol-1and 70.0 kJ mol-1respectively, what is the apparent overall energy of activation?

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a

67.5 kJ mol-1

b

130.0 kJ mol-1

c

65.0 kJ mol-1

d

100.0 kJ mol-1

answer is D.

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Detailed Solution

Apparent overall energy of activation

Eoverall =k1E1+k2E2k1+k2

 k1=1.0×10-2dm3

k2=3.0×10-2 dm3

E1=60.0 kJ

E2=70.0 kJ

Eoverall =65.0 kJ mol-1

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