The rate constant for the first order decompositon of ...

CBSE Class 12 Chemistry 2016 Delhi Set 1 Solved Paper

Question : 13

Total: 26

The rate constant for the first order decompositon of H2O2 is given by the following equation :
log‌k=14.2−‌

1.0×104

K‌; ‌
Calculate Ea for this reaction and rate constant k if its half-life period be 200 minutes.
(Given : R=8.314JK−1mol−1 )

Solution:

log‌k=‌

log‌A−Ea

2.303‌RT

‌
‌

2.303‌RT

‌=‌

1.0×104K

Ea‌=1.0×104×2.303×8.314
‌=191471.4J∕mol
t‌

‌=‌

0.693

k‌=‌

0.693

200

‌min
‌=0.0034min−1

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