Chemistry, 07.03.2020 04:14 mckleinrivero

The rate constant for a certain reaction is kkk = 3.50×10−3 s−1s−1 . If the initial reactant concentration was 0.450 MM, what will the concentration be after 19.0 minutes?

A zero-order reaction has a constant rate of 3.50×10−4 M/sM/s. If after 65.0 seconds the concentration has dropped to 3.50×10−2 MM, what was the initial concentration?

Answers: 2

Show answers

Answers

The rate law is defined as the amount of reactant present in the initial concentration and used up during the course of the reaction. The rate depends on the following:-

Amount Pressure Volume

According to the question, the expression of the rate is Rate = k[A][B] . As the data are given in the question, the rate constant is $3.50×10^{-3}1/s$ , the initial concentration [A]_o = 0.450 M and time is 19 minutes that is the 1140s.

We have to find the final concentration, Integrated rate law for a first-order reaction is given as;

$ln[A] = ln[A]_o - kt\\ln[A] = ln (0.450) - (3.50*10^-^3)1140\\ln[A] = -0.799 - 3.99\\ln[A] = -4.789\\[A] = 0.0083M$

For the second problem, the data given is as follows:-

Rate constant , k = 3.50*10^-^4 M/s

Time = 65 s Final Concentration [A] = 3.50*10^-^2 M

We have to find the Initial Concentration, after solving the equation.

$[A] = [A]_o - kt[A]_o = [A] + kt\\[A]o = 3.50*10^{-2} + (3.50*10^{-4}) * 65\\[A]_o = 3.50*10^{-2} + 0.02275\\[A]_o = 0.05775 M$

Hence, the final concentration is 0.5775m.

For more information, refer to the link:-

link

Answer from: dranio

Explanation:

Question 1

Rate constant = 3.50×10−3 s−1

Initial Concentration [A]o = 0.450 M

Final concentration [A] = ?

time = 19 minutes = 1140 s (upon conversion to seconds)

Integrated rate law for a first order reaction is given as;

ln[A] = ln[A]o - kt

ln[A] = ln (0.450) - (3.50×10−3)1140

ln[A] = -0.799 - 3.99

ln[A] = -4.789

[A] = 0.0083M

Question 2

Rate constant, k = 3.50×10−4 M/s

time = 65 s

Final Concentration [A] = 3.50×10−2 M

Initial Concentration [A]o = ?

Integrated rate law for a first order reaction is given as;

[A] = [A]o - kt

[A]o = [A] + kt

[A]o = 3.50×10−2 + (3.50×10−4) * 65

[A]o = 3.50×10−2 + 0.02275

[A]o = 0.05775 M

Answer from: Quest

i wish i could but this one is weird give me abc and i can solve it.

Answer from: Quest

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

Another question on Chemistry

Chemistry, 21.06.2019 23:00

How manyatoms of mercury are in 1.4214e+1 ml sample

Answers: 1

Answer

Chemistry, 21.06.2019 23:50

How does a scientist the government? a. the scientist tells people in society what to do. b. the scientist determines the policies that the government spends money on. c. the scientist provides unbiased information to the government. d. the scientist makes laws based on his or her research results.

Answers: 1

Answer

Chemistry, 22.06.2019 03:00

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Answers: 1

Answer

Chemistry, 22.06.2019 16:00

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy

Answers: 1

Answer

You know the right answer?

The rate constant for a certain reaction is kkk = 3.50×10−3 s−1s−1 . If the initial reactant concent...

Questions