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
How can we remove the hardness of water by boiling?​
pantera1 [17]

Heat makes it softer

5 0
3 years ago
How can these objects all weigh the same but be different sizes?
Mrrafil [7]
Density/Earth’s gravitational pull.
5 0
2 years ago
Which of the following compounds are held together by ionic bonds? Select all that apply.
Sergeu [11.5K]

Answer:

Explanation:

All of above except carbon dioxide

7 0
3 years ago
The benedict's test indicates a positive result when the solution turns.
aleksandrvk [35]
it turns yellow to orange
7 0
2 years ago
1929 cm3 of gas is how many L of gas
Korolek [52]

Answer:

1.929 Liters of gas

Explanation:

3 0
2 years ago
Other questions:
  • Is Cs2O2 a ionic compound, Covalent compound, or Acid
    14·1 answer
  • Hrjrhrhrvtchtjntokrjt​
    15·1 answer
  • What are the horizontal (from left to right) parts of the periodic table called?
    10·2 answers
  • How many lbs. of O2 are required to fully convert 1-lb of glucose (C6H12O6) to carbon dioxide and water
    10·1 answer
  • Watson and Crick worked out the structure of DNA molecules in 1952. This discovery affected the legal system that is used in soc
    5·2 answers
  • The weight of the body in the air is .... the weight of the submerged body
    15·1 answer
  • Are elecronegativity values higher for metals than nonmetals.
    5·1 answer
  • Which type of measurements is used more often by scientists?
    15·2 answers
  • Nuclear fusion please help :/
    9·1 answer
  • Why can groundwater only collect in rock that is porous?
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!