Fri QUESTION 5 2 points Save Answer Which of these statements iv/are true? 1. Th

Question

Fri QUESTION 5 2 points Save Answer Which of these statements iv/are true? 1. The own order for the rate law,rate-kfA is3. overal order for the rate law, rate-4A7m.3. 1 2. The half-ite of a seoond order reaction is constant 3. The rate law of a reaction can be determined from the balanced equation 4. For a first order reaction, when the concentration is halved, the rate is also halved Oa. Statment 1. O b. Statements 2 &3 Oe Statements 1&4 Question Compietion Status QUESTION 6 1 points Save Answer A When the Ob. 1 Od.3 reaction 2A B +Cisstudied, a plotofnA vstime gives a straight le with a negative slope. The reation order QUESTION 7 1 points Save Anwrer Compound A reacts in a frst order process The rate constant for the reaction is determined by experiment to be 0.049s. How many seconds wil i take for the amount of A to decrease to 1/4 of its original amount? 734

Explanation / Answer

Answer-4)

For second order reaction integrated ratee law is given as,

(1 / [A]) = (1/[A0]) + kt .................(1)

where,

k = rate constant for second order reaction.

[A0] = Initial conceentration of reactatnt (i.e. at t = 0 sec)

[A] = Concentration of reactatnt after time t (in sec)

t = time interval.

Given chemical decomposition,

2NOBr --------> 2NO + Br2

It follows second order kinetics.

Given data:

[A0] = [NOBr] = 0.05 M

k = 0.8 M-1s-1.

t = 13 sec

[A] = final concentration of NOBr = ?

Using using values in eq.(1) we get,

(1 / [A]) = (1/0.05]) + 0.8 x 13

(1 / [A]) = 20 + 10.4

(1 / [A]) = = 30.4

[A] = 1 / 30.4

[A] = 0.033 M

After 13 s [NOBr] will be 0.033 M.

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