temperature of a reaction results in an increase in the reaction rate because: A
ID: 811934 • Letter: T
Question
temperature of a reaction results in an increase in the reaction rate because: A. it lowers the activation energy (Ea) of the reaction. B. it increases the kinetic energy of the reactant molecules.. C. it ensures for correct orientation of reactant molecules upon collision. D. it lowers the rate constant of the reaction. 18. Living organisms show radioactivity at the rate of 15.30 disintegrations per minute per gram of carbon. The radioactivity of a mummy was measured as 11.64 disintegrations per minute per gram of carbon. The half-life for ^14C ?s 5730 years. What is the age of the mummy? A. 4520 years B. 3133 years C. 2260 years D. 1567 years 19. Which of the following compounds exhibit cisExplanation / Answer
17- B
18
We know that, t = (2.303/k) x log N0/N
where k is the rate constant, N0 is the initial amount of carbon-14 and N is the final amount of carbon-14.
k = 0.693/ half life
k = 0.693/5730
now let's plug in the value of k in the first order equation,
t = 2.303/0.693/5730 x log 15.3/11.64 = 1.90 X 10^4 X
on solving this, t = 2255.3 years
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