NEET Chemistry Chemical Kinetics Questions Solved


For the reaction, C2H5I+OH-C2H5OH+I- the rate constant was found to have a value of 5.03×10-2mol-1dm3s-1 at 289 K and 6.71 mol-1 dm3s-1 at 333 K. 

What is the rate constant at 305 K ?

(A) 1.35 mol-1 dm3 s-1                       (B) 0.35 mol-1 dm3 s-1

(C) 3.15 mol-1 dm3 s-1                      (D) 7.14 mol-1 dm3 s-1

(B) k1=5.03×10-2mol-1dm3s-1at T1=289 Kk2=6.71mol-1dm3s-1at T2=333 K

log6.715.03×10-2=Ea2.303×8.314333-289333×289

On solving we get, Ea= 88.914 kJ The rate constant at 305 K may be determined from the relation,

logk35.03×10-2=88.9142.303×8.3141298-1305

On solving we get,k3 = 0.35 mol-1 dm3 s-1

 

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