The decomposition of a to form b is first order in a and has a rate constant k =

Question

The decomposition of a to form b is first order in a and has a rate constant k = 2.75 x 10^-2 s at 20 c.

a) What is the half life of the reactant at 20C?

b)If the concentration of A is found to be 3.21 x 10^-4 mole/L at t = 300s, what was the initial concentration of A at 20C

c)next, the temperature is then raised to 60C, and the decomptositon of a to b is performed again. What is the value of k at 60c, given that Ea = 75.5 kJ/mole and k = 2.75 x 10^-2 s^-1 at 20C?

d) What is the half life of the decomposition of A at 60C?

e)If the concentration of a is found to be 2.78 x 10^-3 mole/L at t= 1.80 s and 60C, what is the initial concentration of a at 60C?

Explanation / Answer

a). half life of the reactant = ln2/k = 25.2 sec

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