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
marissa [1.9K]
3 years ago
5

If 12.5 grams of the original sample of cesium-137 remained after 90.6 years, what was the mass of the original sample?

Chemistry
1 answer:
myrzilka [38]3 years ago
8 0

Answer:

Mass of original sample = 100 g

Explanation:

Half life of cesium-137 = 30.17 years

t_{1/2}=\frac {ln\ 2}{k}

Where, k is rate constant

So,  

k=\frac{\ln2}{t_{1/2}}

k=\frac{\ln2}{30.17}\ year^{-1}

The rate constant, k = 0.02297 year⁻¹

Time = 90.6 years

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

Where,  

[A_t] is the concentration at time t

[A_0] is the initial concentration

Initial concentration [A_0] = ?

Final concentration [A_t] = 12.5 grams

Applying in the above equation, we get that:-

12.5\ g=[A_0]e^{-0.02297\times 90.6}

[A_0]=\frac{12.5}{e^{-0.02297\times 90.6}}\ g=100\ g

<u>Mass of original sample = 100 g</u>

You might be interested in
What colors would an artificial plant-growth light favor to promote plant growth effectively?
Semenov [28]
Red and blue but im not sure abt the percentage.
3 0
3 years ago
What is the average kinetic energy of 1 mole of a gas at -32 degrees Celsius? (R = 8.314 J/K-mol)
romanna [79]

Answer:

3.01 x 103 J

Explanation:

To determine the average kinetic energy of a gas, it is necessary to use the equation, KE = 3/2 RT. The value of R, multiplied by the temperature, and multiplied by 3/2, can provide the average kinetic energy of the gas.

3 0
3 years ago
Is volume and mass size-dependent
Otrada [13]
A size dependent property is a physical property that changes when the size of an object changes.
6 0
3 years ago
Are properties such as odor, color, density, and solubility physical or chemical properties?
storchak [24]
Physical properties- color, density, solubility.
<span>Chemical property- odor.

</span>You see, a physical property<span> is any property that can be </span>measured<span> , and a one that </span><span>describes the state of the physical system.
</span>
https://socratic.org/questions/are-properties-such-as-odor-color-density-and-solubility-physical-or-...
8 0
3 years ago
Read 2 more answers
Who had the idea to study humans as groups rather than as individuals?
Vedmedyk [2.9K]
<span><span>V. C. Wynne-Edwards and Konrad Lorenz were the first authors to raise the concept of altruism</span><span>. This was later reiterated by  </span>David Sloan Wilson, E. O. Wilson and Elliott Sober<span> in 1994 whose works referred to social organisms such as ants</span></span>.




6 0
3 years ago
Read 2 more answers
Other questions:
  • How many molecules are contained in a 7.20-g sample of dimethylmercury?
    8·2 answers
  • What pressure will be exerted by 26g if CO2 at a temperature of 35C and a volume of 550ml?
    8·1 answer
  • 24g of magnesium reacts with 38 g of fluoride o produce __ g magnesium fluoride
    8·1 answer
  • If the chemical properties of a substance remain unchanged and the appearance or shape of an substance changes it is called a
    5·2 answers
  • Cumene (isopropylbenzene) is a relatively inexpensive commercially available starting material. Show how you could prepare m-iso
    15·1 answer
  • Running the dishwasher only one and it's completely full is an example of. PLZ HELP ME :)
    13·2 answers
  • Help quick! Will mark brainlest!
    7·1 answer
  • What can the flow of electrons be easily compared to?
    5·1 answer
  • Propose a synthesis of phenylacetaldehyde from bromobenzene
    14·1 answer
  • The magnetic effect of a magnet is strongest at _____.
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!