he What is the change in energy for Reaction B? What is the activation energy fo
ID: 826893 • Letter: H
Question
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What is the change in energy for Reaction B? What is the activation energy for Reaction B? What is the change in energy for Reaction A? The decomposition of N2O5 can be described by the equation Given these data for the reaction at 45 degree C in carbon tetrachloride solution, calculate the average rate of reaction for each successive time interval. Which three of the following factors will NOT increase the rate of the reaction A+B rightarrow AB ? The half-lives of different medical radioisotopes are given in the table below. If the initial amount of iodine-125 is 34 mCi, how much iodine-125 is left in the body after 180 days?Explanation / Answer
reactionA
DE = -100 Kj/mol
Ea = 25 Kj/mol
reactionB
DE = 25Kj/mol
Ea = 75 Kj/mol
Avg rate of reaction = - DX/Dt = - (2.36 - 2.70)/(215-0) = 0.0016M/sec
increasing the conc, of AB
decreasing the conc.of B
decreasing the kinetic energy
K1 = 2.303/t log(initial/final)
but K1 = 0.693/t1/2
K1 = 0.693/60 = 0.01155 days^-1
0.01155 = 2.303/180 log(34/final)
final = 4.25 mci
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