MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryChemical kineticsDifferential and Integral Forms of Rate Law
The rate constant of a first order reaction is 15 ×10-3 s–1. How long will 5.0 g of this reactant take to reduce to 3.0 g?
A.34.07 s✓ Correct
B.7.57 s
C.10.10 s
D.15 s
Explanation
Integrated rate law for 1st reaction is 0 2.303log t A kt A we can take mass of reactant So, 5 2.303log 3 kt 3 3 2.303 2.303 0.22 log5 log3 33.775 15 10 15 10 t x x x
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