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
alexira [117]
2 years ago
10

A radioactive isotope has a half-life of 2 minutes. How many total minutes will it take for 100-g of the isotope to get to just

6.25-g remaining
Chemistry
2 answers:
sergij07 [2.7K]2 years ago
6 0

Answer:

8 minutes

Explanation:

G(g)                 T(min)

100 --------------- 0

50-------------------2

25 -------------------4

12.5  ---------------  6

6.25 ----------------8

     another    way:

100/6.25 = 16

  16 = 2⁴       ( 4 half lives)    

Each half life is 2 minutes

so 4 half lives will be 8 minutes

andreev551 [17]2 years ago
4 0

Answer:

It would take 12 minutes.

You might be interested in
If 4.50 l of water vapor at 50.2 °c and 0.121 atm reacts with excess iron, how many grams of iron(iii) oxide will be produced?
Flura [38]
When the balanced equation for this reaction is:
2Fe + 3H2O → Fe2O3  +  3H2

and according to the vapour pressure formula:
PV= nRT
when we have P is the vapor pressure of H2O= 0.121 atm
and V is the volume of H2O = 4.5 L
and T in Kelvin = 52.5 +273 = 325.5 K
R= 0.08205 atm-L/g mol-K
So we can get n H2O
So, by substitution:
n H2O = PV/RT
            = (0.121*4.5)/(0.08205 * 325.5) = 0.02038 gmol
n Fe2O3 = 0.02038 * (1Fe2O3/ 3H2O) = 0.00679 gmol
Note: we get (1FeO3/3H2O) ratio from the balanced equation.
we can get the Mass of Fe2O3 from this formula:
Mass = number of moles * molecular weight       
  when we have a molecular weight of Fe2O3 = 159.7
          =  0.00679 * 159.7 = 1.084 g
∴ 1.084 gm of Fe2O3 will produced
6 0
3 years ago
Read 2 more answers
Why do electrons transition between energy levels within the atom, and how do we detect these transitions?
Sedaia [141]

Answer:

See explanation

Explanation:

Electrons transition between energy levels in an atom due to gain or loss of energy. An electron may gain energy and move from its ground state to one of the accessible excited states. The electron quickly returns to ground state, emitting the energy previously absorbed as a photon of light. The wavelength of light emitted is measured using powerful spectrometers.

Atoms can be excited thermally or by irradiation with light of appropriate frequency.

7 0
2 years ago
What do the dots around a symbol in a Lewis structure represent?
anzhelika [568]
B. valence electrons
3 0
2 years ago
Which of the following factors affects the amount of heat absorbed by a substance? (5 points) a. Shape of the substance b. Melti
Ainat [17]

Answer:

d. Specific heat capacity of the substance

8 0
3 years ago
Read 2 more answers
What is the main difference between a proton and a neutron?
Olenka [21]
I’m pretty sure it’s B since ones charge the neutral while ones is positive, it’s an obvious difference as well/
5 0
2 years ago
Read 2 more answers
Other questions:
  • Circle the term that does not belong in each of the following groups: KCl NaCl NaHCO3 MgSO4
    7·1 answer
  • True or False, the central atom in a molecule is the one with the highest electron affinity.
    6·1 answer
  • Is mass conserved when 50 g of sugar undergoes a physical change?
    7·2 answers
  • PLEASE HELP ME :( It’s urgent!!!!!
    11·1 answer
  • Does the iconic compound NaCl have the same particles as the individual elements of sodium and chlorine gas
    8·1 answer
  • Which of the following objects would have the most inertia?
    7·2 answers
  • What properties of matter explain why the weight of an object on the moon is different than the weight of the same object on ear
    8·1 answer
  • How does brock answer the charge that euthanasianis the deliberating killing of na innocent person?
    12·1 answer
  • Briefly explain Potassium with 19 protons and 19 neutrons
    10·1 answer
  • What is the major organic product obtained from the reaction of ethylbenzene with nitronium ion, followed by benzylic oxidation?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!