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]
2 years ago
11

The half life of iodine-125 is 60 days. What fraction of 125I nuclides would be left after 360 days?

Chemistry
1 answer:
Agata [3.3K]2 years ago
3 0

Answer:

THE FRACTION OF IODINE-125 REMAINING AFTER 360 DAYS IS 1/64.

Explanation:

half life of iodine- 125 = 60 days

Time elapsed for a decay = 360 days

using the formula:

                            Nt = No (1/2)^t/t1/2

The fraction left after a decay will be represented as:

Nt / No = (1/2) ^t/t1/2

Nt / No = (1/2) ^ 360 /60

Nt / No = (1/2) ^6

Nt / No = 1 / 64

The fraction of iodine-125 (Nt / No) remaining after 360 days is 1/ 64.

You might be interested in
Can someone help me answer C
Digiron [165]

because B has more Surface are.

8 0
3 years ago
Sulfuric acid is essential to dozens of important industries from steelmaking to plastics and pharmaceuticals. More sulfuric aci
Pavlova-9 [17]

Given:

K = 0.71 = Kp

The reaction of sulphur with oxygen is

                            S(s)   + O2(g)  ---> SO2(g)

initial Pressure                   6.90         0

Change                                -x            +x

Equilibrium                     6.90-x          x

Kp = pSO2 / pO2 = 0.71 = x / (6.90-x)

4.899 - 0.71x  = x

4.899 = 1.71x

x = 2.86 atm = pressure of SO2 formed

temperature = 950 C = 950 + 273.15 K = 1223.15 K

Volume = 50 L

Let us calculate moles of SO2 formed using ideal gas equation as

PV = nRT

R = gas constant = 0.0821 L atm / mol K

putting other values

n = PV / RT = 2.86 X 50 / 1223.15 X 0.0821 = 1.42 moles

Moles of Sulphur required = 1.42 moles

Mass of sulphur required or consumed = moles X atomic mass of sulphur

mass of S = 1.42 X 32 = 45.57 grams or 0.04557 Kg  of sulphur



 


6 0
3 years ago
What type of metamorphic rock will granite normally become following high-grade metamorphism?
posledela

The type of metamorphic rock which will granite is Gneiss.

Explanation:

<h3>Hope it helps...</h3>
5 0
2 years ago
Read 2 more answers
Substance formed by the chemical combination of elements is called
nikitadnepr [17]

Answer:

chemical equation

Explanation:

3 0
3 years ago
Define "Mutarotation"
zubka84 [21]

Answer:

Mutarotation refers to the change in the optical rotation or optical activity of a solution due to the change in the equilibrium of the two anomers. It depends upon the optical activity and ratio of the anomeric forms in the solution.

To measure the optical rotation of a given solution, a polarimeter can be used and thus the ratio of the anomeric forms can be calculated.

3 0
2 years ago
Other questions:
  • The enthalpy change for the reaction of titanium metal with gaseous iodine is given by the following thermochemical equation: 2
    10·1 answer
  • What type of reaction breaks the bonds that join the phosphate groups in an ATP molecule?
    5·1 answer
  • What is created when combustion happens without enough oxygen?
    6·1 answer
  •  Some athletes have as little as 3.0% body fat. If such a person has  body  mass of 65 kg,how many pounds of body fat  does  tha
    10·1 answer
  • Which of these is an indication that a chemical reaction has occurred? A.Melting of a substance B.Boiling of a substance C.Forma
    6·1 answer
  • Which element has a greater atomic radius Mg or Cl?
    11·1 answer
  • A student says that since the atomic theory is just a theory, it should not be considered useful. Which
    11·1 answer
  • CAN SOMEONE PLEASE HELP ME I would appreciate it so much <br><br> Lab:Charles Law Data
    13·1 answer
  • Who was one of the first scientists to realize the effects of CO2 in the atmosphere?
    13·1 answer
  • what is the equation relating to the energy separation between levels in the H atom to the number of the level (n) called?​
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!