Question

# A→B zero order reaction  C→D first order reaction If the first order reaction gets 75% completed in 40 minutes and zero order reaction gets 75% completed in 30 minutes then calculate the value of Z, where Z is ratio of half life of first order and zero order reaction

Solution

## The integral rate equation for first order reaction  is t=1klnaa−x Now 40=1klnaa−0.75a k=240(ln2) min−1 t1/2=ln2k=20min for zero order reaction rate of reaction does not depend on concentration and it is constant through out the reaction progress so if 75 % is consumed in 30 min then by unitary method t1/2=20 min so Z=2020=1

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