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
Salsk061 [2.6K]
3 years ago
12

An isotope has a half-life of 10 minutes. after 20 minutes, what percentage of the original nuclei remain?

Chemistry
1 answer:
Elena-2011 [213]3 years ago
6 0
To solve this, we can use two equations.
t1/2 = ln 2 / λ = 0.693 / λ  
   
where, t1/2 is half-life and λ is the decay constant.

t1/2 = 10 min = 0.693 / λ

Hence, λ = 0.693 / 10 min              -         (1)

Nt = Nο e∧(-λt)    
                
Nt = amount of atoms at t =t time
Nο= initial amount of atoms
t = time taken

by rearranging the equation,
Nt/Nο = e∧(-λt)                  -  (2)

From (1) and (2),

Nt/Nο = e∧(-(0.693 / 10 min) x 20 min) 
Nt/Nο = 0.2500

Percentage of remaining nuclei = (nuclei at t time / initial nuclei) x 100%
                                                     
= (Nt/Nο ) x 100%
                                                      = 0.2500 x 100%
                                                      = 25.00%

Hence, Percentage of remaining nuclei is 25.00%
You might be interested in
You have dissolved 10 g sodium oxide in 200 ml water.calculate concentration of the solution
e-lub [12.9K]

Answer:

0.85 Molar Na2O

Explanation:

Determine the moles of sodium oxide, Na2O, in 10 grams by dividing by the molar mass of Na2O (61.98 g/mole).

 (10 g Na2O)/(61.98 g/mole) = 0.161 moles Na2O.

Molar is a measure of concentration.  It is defined as moles/liter.  A 1 M  solution contains 1 mole of solute per liter of solvent.  [200 ml water = 0.2 Liters water.]

In this case, we have 0.161 moles Na2O in 0.200 L of solvent.

 (0.161 moles Na2O)/(0.200 L) = 0.85 Molar Na2O

8 0
2 years ago
Relative mass each element contributes to the mass as a whole is _________.
Korolek [52]
Your a furry cause I don’t know
3 0
3 years ago
What is migrate? Help me pls
Juliette [100K]
Means moving from one place to the other
8 0
3 years ago
Read 2 more answers
Match each element with the element that is most similar to it. If you don’t know the answer, use this periodic table to help yo
yan [13]

Answer:

Lithium - Potassium

Carbon - Silicon

Fluorine - Bromine

Oxygen - Sulfur

Explanation:

I hope this helps!! :3

5 0
3 years ago
What two parts are found in the nucleus
cricket20 [7]
Protons and neutrons
5 0
3 years ago
Other questions:
  • The building block of silicate minerals is called the _____. A) silicon-oxygen tetrahedron. B) aluminum-oxygen tetrahedron. C) s
    6·2 answers
  • What is the value of X?
    8·2 answers
  • PLEASE HELP! 15 POINTS!!!!!
    14·1 answer
  • Ravi’s grandmother is suffering from diabetes. Her doctor advised her to take lassi with less fat content. Which of the followin
    13·1 answer
  • A West Virginia coal is burned at a rate of 8.02 kg/s. The coal has a sulfur content of 4.40 % and the bottom ash contains 2.80
    8·1 answer
  • How is a mole like a dozen?
    6·2 answers
  • What is the value of work done on an object when a 50–newton force moves it 15 meters in the same direction as the force?
    5·1 answer
  • Imagine a moving boat making waves in the middle of a pool of water. Also, imagine two observers, one behind the boat and one in
    7·1 answer
  • I need to someone to explain the whole being of Chemistry. I do not understand a single thing, nothing makes sense to me. Litera
    9·1 answer
  • What is the difference between a rock and a mineral ? Plz only (1-2 sentence) thx sm!
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!