1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Annette [7]
2 years ago
8

A certain first-order reaction (A→products) has a rate constant of 7.20×10−3 s−1 at 45 ∘C. How many minutes does it take for the

concentration of the reactant, [A], to drop to 6.25% of the original concentration?
Express your answer with the appropriate units.
Chemistry
1 answer:
lesya692 [45]2 years ago
6 0

Answer:

6,41 min

Explanation:

For the reaction:

A → products

kinetics first-order reaction law is:

ln[A] = ln[A]₀ -kt

Where [A] is concentration of reactant, [A]₀ is initital concentration of reactant, k is rate constant and t is time.

If the concentration of A is 6,25% you can assume:

[A] = 6,25; [A]₀= 100. Replacing:

ln(6,25) = ln(100) -7,20×10⁻³s⁻¹t

-2,7726 = -7,20×10⁻³s⁻¹t

385s = t

In minutes:

385s×\frac{1min}{60s} = <em>6,41 min</em>

<em></em>

I hope it helps!

You might be interested in
Write the ions present in a solution of na3po4. express your answers as chemical formulas separated by a comma. offset subscript
spin [16.1K]
Sodium/natrium is a metal from first column group so it should have one 1+ charge. Phosphate ion has 3- charge. That is why there 3 natrium ion for 1 phosphate ion when this molecule is dissolved in water. The ion formula would be:

(Na)_{3}(PO_{4}) ==> 3 Na^{1+}   +  PO_{4} ^{3-}
6 0
3 years ago
4.00 dm of oxygen at a pressure of 2 atm and 1.00 dm3 nitrogen at a pressure of 1 atm are introduced into a 2.00 dm3 vessel.
podryga [215]

Answer:

A

Explanation:

5 0
2 years ago
Which ones are wrong please tell the right answer it Hlep me a lot
DiKsa [7]
13.) would be cytoskeleton and number 16.) would be lysosomes
6 0
3 years ago
A machine
rosijanka [135]

i believe the answer is A (((:

4 0
2 years ago
Read 2 more answers
What is the molarity of a solution composed
Neporo4naja [7]

Answer:

0.0845 M

Explanation:

First we <u>convert 4.27 grams of potassium iodide into moles</u>, using its <em>molar mass</em>:

  • Molar Mass of KI = 166 g/mol
  • 4.27 g ÷ 166 g/mol = 0.0257 mol

Now we <u>calculate the molarity of the solution</u>, using <em>the number of moles and the given volume</em>:

  • Molarity = moles / liters
  • Molarity = 0.0257 mol / 0.304 L = 0.0845 M
7 0
3 years ago
Other questions:
  • Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reactio
    14·2 answers
  • What is the process in which coal is heated in the absence of air? Name the process.
    9·1 answer
  • I need to know how do awnser this pease help.
    12·1 answer
  • An element has the following natural abundances and isotopic masses: 90.92% abundance with 19.99 amu, 0.26% abundance with 20.99
    11·1 answer
  • For the reaction 3F2 + Cl2 --&gt; 2ClF3 what is the maximum amount of ClF3 which could be formed from 9.86 g of F2 and 17.46 of
    11·1 answer
  • Is this statement true or false?
    12·1 answer
  • Calculate the number of moles of 2 g hydrogen gas
    8·1 answer
  • If 50 mL of pure acetone is mixed with 450 mL of water, what is the percent by volume of acetone?
    13·1 answer
  • Boyle's Law
    14·2 answers
  • Ammonia and hydrogen fluoride both have unusually high boiling points due to
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!