Homework Answers
Given:
Half life = 20 hrs
use relation between rate constant and half life of 2nd order reaction
k = 1/([A]o*half life)
= 1/(0.75*20)
= 6.667*10^-2 M-1.hrs-1
we have:
[A]o = 0.75 M
[A] = 0.25 M
k = 6.667*10^-2 M-1.hrs-1
use integrated rate law for 2nd order reaction
1/[A] = 1/[A]o + k*t
1/(0.25) = 1/(0.75) + 6.667*10^-2*t
4 = 1.333 +6.667*10^-2*t
6.667*10^-2*t = 2.667
t = 40 hrs
Answer: 40 hrs
Add Answer to:
en a) woled rolo obizno OM 6. Consider the reaction 3A C. If the reaction is...
6. Consider the reaction 3A - C. If the reaction is second order with a half-life...
6. Consider the reaction 3A - C. If the reaction is second order with a half-life of 20.00 hrs. Starting the reaction with an initial concentration of A as 0.75M, calculate the time required for the concentration to decrease to 0.25M (8 points)
6. Consider the reaction 3A C. If the reaction is second order with a half-life of 20.0) hrs. Starting the reaction...
6. Consider the reaction 3A C. If the reaction is second order with a half-life of 20.0) hrs. Starting the reaction with an initial concentration of A as 0.75M, calculate the time required for the concentration to decrease to 0.25M (8 points)
4. The rate constant for the reaction 3AAR is 250 x 10 molminHow long will it...
4. The rate constant for the reaction 3AAR is 250 x 10 molminHow long will it take the concentration of A to drop from 0.75 M to 0.50 M? (6 points) 5. The rate constant for the reaction 3A - 2B is 0.0447 5. What is the half-life of the reaction? (2 points) 6. Consider the reaction 3A C. If the reaction is second order with a half-life of 20.0 hrs Starting the reaction with an initial concentration of A...
For the following reaction, the concentration of A and the amount of time required to decrease that concentration t...
For the following reaction, the concentration of A and the amount of time required to decrease that concentration to one-half of the initial concentration, (vz, are directly proportional. Therefore, a decrease in concentration of A shows a proportional decrease in the half life, tv2. A products What is the order of this reaction? 2 If the rate constant for this reaction is o.0493 M s-1at 400 C, what is the half-life of this reaction, given an initial concentration of 0.821...
8. Consider the reaction: A → B The rate of the reaction is 1.6 × 10−2 M/s when the concentration of A is 0.35 M. Calcul...
8. Consider the reaction: A → B The rate of the reaction is 1.6 × 10−2 M/s when the concentration of A is 0.35 M. Calculate the rate constant if the reaction is first order in A. Enter only the numerical value for the rate constant in the answer box. 9. The reaction 2A → B is second order with a rate constant of 51.0/M·min at 24°C. (a) Starting with [A]0 = 9.50 × 10−3M, how long will it take...
1. The second-order rate constant for self-reaction of hydroxyl radicals 2 OH → H2O + O...
1. The second-order rate constant for self-reaction of hydroxyl radicals 2 OH → H2O + O has the value 1.0786E9 M-1·s-1 at 360.0 K. Compute the half-life of OH radicals at this temperature if the initial concentration is 6.74E-6 M. 3. Calculate the initial rate of a first-order reaction if the concentration of reactant is 0.37 M and the half-life is 4.48 s. Enter the correct numerical value to 2.0% precision. Express scientific notation like 4.29E-15 M·s-1 4. Cyano...
For this question, consider the reaction A-->B with a rate constant k=7.17x10^-4 m/s. A.)In one experiment,...
For this question, consider the reaction A-->B with a rate
constant k=7.17x10^-4 m/s.
A.)In one experiment, the half life for A is determined to be
15.00 minutes. What was the initial concentration of A?
B.) In a different experiment, it takes 15.00 minutes for the
concentration of A to decrease by 28%. What was the initial
concentration of A in this trial?
ate dete ate law for this rance of pros Name: TA Name: Student ID: Section number: Aneta 10For...
The half-life of a reaction, t1/2, is the time it takes for the reactant concentration [A]...
The half-life of a reaction,
t1/2, is the time it takes for the reactant concentration [A] to
decrease by half. For example, after one half-life the
concentration falls from the initial concentration [A]0 to [A]0/2,
after a second half-life to [A]0/4, after a third half-life to
[A]0/8, and so on. on. For a first-order reaction, the half-life is
constant. It depends only on the rate constant k and not on the
reactant concentration. It is expressed as t1/2=0.693k For a...
The rate law for the reaction 3A(g) → C(g) is rate-kAI2 where k = 4.36 x...
The rate law for the reaction 3A(g) → C(g) is rate-kAI2 where k = 4.36 x 10-2 Mhrl. The initial concentration of A is 0.250 M. a) How long will it take for [A] to reach 1/6 of its initial concentration b) What is the half-life of this reaction? c) What is the concentration of A after 10.0 hr?
3. A reaction 2A 2B + C is known to follow second-order kinetics, with k =...
3. A reaction 2A 2B + C is known to follow second-order kinetics, with k = 7.20x10*M's' at 25.0 °C. (20 points) During one experiment, the initial concentration of A is [A]. = 0.120 M (a) Calculate the half-life (1,2), in hours, for this experiment. (b) Calculate the initial reaction rate (in M/s) for this reaction (4 points) (c) How long will it take (in hours) for the concentration of C to reach [C] = 0.0540 M (6 points) (d)...
6. Consider the reaction 3A - C. If the reaction is second order with a half-life of 20.00 hrs. Starting the reaction with an initial concentration of A as 0.75M, calculate the time required for the concentration to decrease to 0.25M (8 points)
6. Consider the reaction 3A C. If the reaction is second order with a half-life of 20.0) hrs. Starting the reaction with an initial concentration of A as 0.75M, calculate the time required for the concentration to decrease to 0.25M (8 points)
4. The rate constant for the reaction 3AAR is 250 x 10 molminHow long will it take the concentration of A to drop from 0.75 M to 0.50 M? (6 points) 5. The rate constant for the reaction 3A - 2B is 0.0447 5. What is the half-life of the reaction? (2 points) 6. Consider the reaction 3A C. If the reaction is second order with a half-life of 20.0 hrs Starting the reaction with an initial concentration of A...
For the following reaction, the concentration of A and the amount of time required to decrease that concentration to one-half of the initial concentration, (vz, are directly proportional. Therefore, a decrease in concentration of A shows a proportional decrease in the half life, tv2. A products What is the order of this reaction? 2 If the rate constant for this reaction is o.0493 M s-1at 400 C, what is the half-life of this reaction, given an initial concentration of 0.821...
For this question, consider the reaction A-->B with a rate
constant k=7.17x10^-4 m/s.
A.)In one experiment, the half life for A is determined to be
15.00 minutes. What was the initial concentration of A?
B.) In a different experiment, it takes 15.00 minutes for the
concentration of A to decrease by 28%. What was the initial
concentration of A in this trial?
ate dete ate law for this rance of pros Name: TA Name: Student ID: Section number: Aneta 10For...
The half-life of a reaction,
t1/2, is the time it takes for the reactant concentration [A] to
decrease by half. For example, after one half-life the
concentration falls from the initial concentration [A]0 to [A]0/2,
after a second half-life to [A]0/4, after a third half-life to
[A]0/8, and so on. on. For a first-order reaction, the half-life is
constant. It depends only on the rate constant k and not on the
reactant concentration. It is expressed as t1/2=0.693k For a...
The rate law for the reaction 3A(g) → C(g) is rate-kAI2 where k = 4.36 x 10-2 Mhrl. The initial concentration of A is 0.250 M. a) How long will it take for [A] to reach 1/6 of its initial concentration b) What is the half-life of this reaction? c) What is the concentration of A after 10.0 hr?
3. A reaction 2A 2B + C is known to follow second-order kinetics, with k = 7.20x10*M's' at 25.0 °C. (20 points) During one experiment, the initial concentration of A is [A]. = 0.120 M (a) Calculate the half-life (1,2), in hours, for this experiment. (b) Calculate the initial reaction rate (in M/s) for this reaction (4 points) (c) How long will it take (in hours) for the concentration of C to reach [C] = 0.0540 M (6 points) (d)...
Most questions answered within 3 hours.
-
What's the streaming business's problem on the
horizon?
asked 22 seconds ago -
I need help with writing the conclusion for this online lab
report
Abstract
By testing the...
asked 13 minutes ago -
For the reaction 1N2+3H2-----> 2NH3, would the reaction rate
trend be: delta[NH3]/ delta t = -2...
asked 48 minutes ago -
Within your current/past organization, identify a problem/issue
and format a design to address same. You may...
asked 30 minutes ago -
A sock stuck to the side of a clothes-dryer barrel has a
centripetal acceleration of 24...
asked 1 hour ago -
A perfect gas undergoes an isentropic process such that its
volume doubles. If the ratio of...
asked 1 hour ago -
list the elements in groups 3A to 6A in the same order as in the
periodic...
asked 2 hours ago -
Estimating effect size. Peng and Chen (2014)
evaluated effect size estimates for various tests. In their...
asked 2 hours ago -
Write a script in MySQL that creates and calls a stored
procedure name test. This procedure...
asked 2 hours ago -
If we test the following: H0: μ = 17
vs. H1: μ ≠ 17 and the...
asked 2 hours ago -
in the past year TVG had revenues of 3 million, cost
of goods sold of $25...
asked 2 hours ago -
4) In a polypeptide, which bond cannot rotate because of its
partial double bond character?
The...
asked 3 hours ago