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The decomposition of compound B has the following rate constants when the reaction is observed at different temperatures. 

Temperature (C) k (M-1s-1)
0 5.6 x10-6
10 3.2 x10-5
20 1.6 x10-4
30 7.6 x10-4

What is the half life of the reaction at 40C when the starting concentration is 7.5x10-3M?

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General Chemistry 2
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Solve problems relating to the effect of temperature on reaction rates
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Related questions

The reaction C2H5I + OH-→ C2H5OH + I- was studied in an ethanol (C2H5OH) solution, and the rate constants observed at different temperatures are represented in the table below. 

Temperature (C) k (s-1)
15.83 5.03 x10-5
32.02 3.68 x10-4
59.75 6.71 x10-3
90.61 1.19 x10-1

What is the half life of this reaction at 75C?

The reaction C2H5I + OH-→ C2H5OH + I- was studied in an ethanol (C2H5OH) solution, and the rate constants observed at different temperatures are represented in the table below. 

Temperature (C) k (s-1)
15.83 5.03 x10-5
32.02 3.68 x10-4
59.75 6.71 x10-3
90.61 1.19 x10-1

What is the activation energy of this reaction?

1. The following data were collected at 20 oC for the reaction of bromphenol blue, HBPB2-, and hydroxide ions, OH-, shown in the equation below

HBPB2- + OH- <---> BPB3- + H2O

a)What is the rate equation for the reaction?

Determination

[HBPB2-]0, M

[OH-]o, M

Rate, M/sec

1

7.22 x 10-6

1.00

9.627 x10-9

2

7.22 x 10-6

0.25

2.490 x10-9

3

3.63 x 10-6

1.00

4.750 x10-

The reaction was run three times with different initial concentrations of the reactants yielding the following rates:

b)Determine the reaction order with respect to HBPB2-

c)Determine the reaction order with respect to OH-

d)Calculate the rate constant for this reaction at 20 oC

e)What is the ‘rate law’ for this reaction?

f)What other information do you need to calculate the activation energy for this reaction?

2. Why is it better to transfer one group of solutions into one flask and a second group into a second flask and then mix them, instead of pipetting the solutions sequentially into the same flask?

3. What will be the concentration of [I-] in the reaction flask after mixing (See Run #6): 1.0 ml starch + 2.0 mL 1.2 x10-2 M Na2S2O3 + 4.0 mL 0.20 M KI + 4.0 mL 0.20 M KNO3 + 4.0 mL 0.20 M (NH4)2S2O8 + 4.0 mL 0.20 M (NH4)2SO4 ?

4. What will be the concentration of [S2O82-] in the same reaction mixture as above?

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