time taken = 69.7 min
initial amount = 100 %
remaining = 20 %
this is first - order reaction .
k = 1/t ln (Ao / At)
= 1/69.7 ln (100 / 20)
k = 0.0231 min-1
rate constant = 0.0231 min-1
OURCES Review Problem 13.077 E incorrect. 13.016 1.002 13.065 13.067 If it takes 69.7 min for...
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 integrated rate law allows
chemists to predict the reactant concentration after a certain
amount of time, or the time it would take for a certain
concentration to be reached. The integrated rate law for a
first-order reaction is: [A]=[A]0e−kt Now say we are particularly
interested in the time it would take for the concentration to
become one-half of its initial value. Then we could substitute
[A]02 for [A] and rearrange the equation to: t1/2=0.693k This
equation calculates the time...
Part A Review ConstantsI Periodic Table How many moles of N2O, will remain after 7.0 min? The first-order rate constant for the decomposition of N2 O Express the amount in moles to two significant digits. 2N2Os (g)+4NO2(g) +02(g) n1.6x10-3 mol at 70° C is 6.82 x 103 s-, Suppose we start with 2.80x102 mol of N2O5 (g) in a volume of 2.0 L You may want to reference (Page) Section 14.4 while completing this problem. Correct The rate of reaction...
The integrated rate law allow chemists to predict the reactant concentration after a certain amount of time, or the time it would take for a certain concentration to be reached. The integrated rate law for a first-order reaction is: [A] = [A]oe -Rt Now say we are particularly interested in the time it would take for the concentration to become one-half of its initial value. Then we could substitute Z" for [A] and rearrange the equation to: A) 1/2= 0093...
1. A certain first order reaction has a rate constant of 0.036 min-1. How much of the reactant will remain if the reaction is run for 2.5 hours and the initial concentration of the reactant is 0.31 M? 2. A certain first order reaction has a rate constant of 0.036 min-1. How much of the reactant will remain if the reaction is run for 2.5 hours and the initial concentration of the reactant is 0.31 M? 3. The rate constant...
The rate constant for a particular reaction that is 1st-order in N2O5 is 0.525 min–1. How much time will it take for the concentration of N2O5 to decrease to one-third its initial concentration? Make sure you pick an answer with the correct units. (Hint: Fora 1st-order reaction, the amount of time it takes to reduce a reactant's concentration to one-third is independent of the initial concentration of reactant.)
Half-life equation for first-order reactions: t1/2=0.693k where t1/2 is the half-life in seconds (s), and k is the rate constant in inverse seconds (s−1). a) What is the half-life of a first-order reaction with a rate constant of 4.80×10−4 s−1? b) What is the rate constant of a first-order reaction that takes 188 seconds for the reactant concentration to drop to half of its initial value? Express your answer with the appropriate units. c)A certain first-order reaction has a rate constant...
Review Problem 7.099 X Incorrect For the shell n = 6, what are the possible values of l (Several choices may be correct.) Click if you would like to Show Work for this question: Open Show Work
+ Half-life for First and Second Order Reactions 11 of 11 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-Me the concentration falls from the initial concentration (Alo to A\o/2, after a second half-life to Alo/4 after a third half-life to A./8, and so on. on Review Constants Periodic Table 11/25 For a second-order reaction, the half-life depends on the rate constant and the...
The rate constant k for a certain first-order reaction is 0.60 min–1. What is the initial rate, if the initial concentration of the reactant is 0.10 M?