Question

In: Chemistry

Part A The reactant concentration in a zero-order reaction was 0.100 M after 105 s and 3.00×10−2 M after 350 s

PLEASE MAKE SURE YOUR ANSWERS ARE CORRECT

Part A

The reactant concentration in a zero-order reaction was 0.100 M after 105 s and 3.00×10−2 M after 350 s . What is the rate constant for this reaction? Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash.

Part B

What was the initial reactant concentration for the reaction described in Part A?

Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash.

Part C

The reactant concentration in a first-order reaction was 7.50×10−2M after 45.0 s and 7.60×10−3M after 100 s . What is the rate constant for this reaction?

Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash.

Part D

Part D

The reactant concentration in a second-order reaction was 0.590 M after 120 s and 4.90×10−2M after 755 s . What is the rate constant for this reaction?

Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash.

Solutions

Expert Solution

for a zero order reaction, the equation is

CA= CAO-Kt, CAO= initial concentration, CA= Concentration at any time, t and K= rate constant and t is the time

For the given conditions is

0.1= CAO- 105K (1)

3/100= CAO- 350K (2)

Eq.1- Eq.2 = 0.1-0.3/100 = (350-105)K

K= 0.000286 M/sec

From Eq.1, 0.1= CAO-105*0.000286

CAO= 0.13M

3.

For a 1st order reaction

lnCA= lnCAO- Kt

CAO= initial concentration, CA= Concentration at any time, t and K= rate constant and t is the time

from the given information

ln(7.5*10-2)= lnCAO-45K (1)

ln(7.6*10-3)= lnCAO- 100K (2)

Eq.1-Eq.2 ln (7.5*10-2/ 7.6*10-3)= (100-45)K

K=0.042/sec


4. for second order reaction 1/CA= 1/CAO+Kt,CAO= initial concentration, CA= Concentration at any time, t and K= rate constant

hence 1/0.59= 1/CAO+K*120, 1.69= 1/CAO+K*120 (1) and 1/(4.9*10-2)= 1/CAO+K*755, 20.41= 1/CAO+755K (2)

Eq.2-Eq.1= 20.41-1.69= K*(755-120), K= 0.02948/M.sec


Related Solutions

Part A The reactant concentration in a zero-order reaction was 9.00×10−2 M after 105 s and...
Part A The reactant concentration in a zero-order reaction was 9.00×10−2 M after 105 s and 1.00×10−2 M after 325 s . What is the rate constant for this reaction? Express your answer with the appropriate units. k0th = Part B What was the initial reactant concentration for the reaction described in Part A? Express your answer with the appropriate units. [A]0 = Part C The reactant concentration in a first-order reaction was 6.70×10−2 M after 25.0 s and 2.20×10−3...
Part A The reactant concentration in a zero-order reaction was 5.00×10−2 M after 190 s and...
Part A The reactant concentration in a zero-order reaction was 5.00×10−2 M after 190 s and 3.50×10−2 M after 370 s . What is the rate constant for this reaction? Express your answer with the appropriate units. Part B What was the initial reactant concentration for the reaction described in Part A? Express your answer with the appropriate units Part C The reactant concentration in a first-order reaction was 8.80×10−2M after 20.0 s and 7.10×10−3M after 60.0 s. What is...
A) The reactant concentration in a zero-order reaction was 9.00×10−2 M after 155 s and 2.00×10−2...
A) The reactant concentration in a zero-order reaction was 9.00×10−2 M after 155 s and 2.00×10−2 M after 365 s . What is the rate constant for this reaction? B) What was the initial reactant concentration for the reaction described in Part A? C) The reactant concentration in a first-order reaction was 9.80×10−2 M after 15.0 s and 6.30×10−3 M after 100 s . What is the rate constant for this reaction? D) The reactant concentration in a second-order reaction...
Part A The reactant concentration in a zero-order reaction was 5.00×10−2M after 190 s and 2.50×10−2M...
Part A The reactant concentration in a zero-order reaction was 5.00×10−2M after 190 s and 2.50×10−2M after 370 s . What is the rate constant for this reaction? Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash. Answer: k0th = 1.39×10−4 Ms Part B What was the initial reactant concentration for the reaction described in Part A? Express your answer with the appropriate units. Indicate the...
A zero order reaction starts with an initial concentration of reactant of 1.00 M and has...
A zero order reaction starts with an initial concentration of reactant of 1.00 M and has a rate constant of 1.65x10-5M/s. What is the concentration of the reactant after 100 seconds?
1.)For a second-order reaction, the initial reactant concentration is 0.62 M. After 36.3 min, the concentration...
1.)For a second-order reaction, the initial reactant concentration is 0.62 M. After 36.3 min, the concentration is 0.22 M. What is k in M-1min-1? 2.) For a second order reaction, the initial reactant concentration, [A]o, is 0.84 M. After 12.6 s, the concentration is 0.62 M. What is [A] after 81 s? Hint given in feedback 3.)For the zero-order rate of reaction A → B + C, what is the concentration of A (in M) after 31.0 s if [A]o...
Suppose the half-life is 55.0 s for a first order reaction and the reactant concentration is...
Suppose the half-life is 55.0 s for a first order reaction and the reactant concentration is 0.0761 M 40.1 s after the reaction starts. How many seconds after the start of the reaction does it take for the reactant concentration to decrease to 0.0183 M?
It takes 41.0 min for the concentration of a reactant in a first-order reaction to drop...
It takes 41.0 min for the concentration of a reactant in a first-order reaction to drop from 0.430 M to 0.310 M at 25.0 oC. How long will it take for the concentration to reach 0.126 Molar? 153   min 60.2   min 87.2 min 0.368 min 71.3   min 50.4 min 5.20 x 102 min 16.9 min
. A reaction in this experiment is started when 3.00 mL of 0.100 M t-butyl chloride...
. A reaction in this experiment is started when 3.00 mL of 0.100 M t-butyl chloride is diluted to a final volume of 10.0 mL. After 150 sec, t1/10 has been reached. a. What is the concentration of t-butyl chloride (molarity) at the start of the reaction? b. What is the value of the rate constant (k) if the reaction is first order? c. What is the value of the rate constant (k) if the reaction is second order? 2....
Sublimation is an example of a zero-order reaction. Provide other examples, and explain why the reactant...
Sublimation is an example of a zero-order reaction. Provide other examples, and explain why the reactant available for reactions is unaffected by changes in the overall quantity of the reactants.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT