MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryChemical kineticsSome Important First Order Reactions
The initial concentration of N2O5 in the following order reaction, N O g 2NO g g -> was 1.24 10 molL x at 318 K. The concentration of N2O5 after 60 min was 0.20 × 10-2 mol L-1. Calculate the rate constant of the reaction at 318 K.
A.0.0104 min-1
B.0.0204 min-1
C.0.0304 min-1✓ Correct
D.0.0404 min-1
Explanation
For a first order reaction, 2 1 1 2 1 2 1 2 R k t t log R 2.303 R 2.303 k log t t R 2 1 2 1 2.303 1.24 10 molL log 60 min 0 min 0.20 10 molL x x 1 1 2.303 log6.2min 60 0.0304min Arrhenius Theory
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