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
salantis [7]
3 years ago
14

After two half-lives, a sample contains 10 grams of parent isotopes. How many grams of the parent isotope were present to start?

Chemistry
2 answers:
Lunna [17]3 years ago
8 0
T=2T
m=10 g

m=m₀2^(-t/T)

m₀=m/{2^(-2T/T)=m/2⁻²

m₀=10/2⁻²=40 g

40 grams
almond37 [142]3 years ago
8 0
Theirs a total of 39.9999G at the start
You might be interested in
Characteristics of bipolar disorder typically include
I am Lyosha [343]
C. Difficulty in concentrating. 
One of the common symptom for Bipolar disorder is the difficulty in concentration or decreased ability to think and indecisiveness. They tend to make wrong decisions because of this symptom. And because they do not think thoroughly, bipolar disorder patients have poor decision making.
3 0
3 years ago
Read 2 more answers
A) ambos pertencem ao 5o período da Tabela Periódica;
Reptile [31]

Answer:

A

Explanation:

8 0
3 years ago
PLEASE HELP WILL GIVE BRAINLIEST
anastassius [24]

Answer:

should be  58.6c

Explanation:

6 0
3 years ago
What are the steps to finding an items density?
Assoli18 [71]
There are 5 steps:
1- measure the mass of the container
2- measure the volume of the liquid
3- measure the combined mass of the liquid and the container.
4-determine the mass of the liquid alone
5-divide the mass by the volume.
3 0
3 years ago
Which of the following explains the importance of the activation energy acting as a barrier for reactants? A:It prevents most re
natita [175]
A: It prevents most reactions from occurring spontaneously.

The answer above is correct.
7 0
3 years ago
Read 2 more answers
Other questions:
  • I. Loosening of immigration policies
    9·1 answer
  • Four ice cubes at exactly 0 ∘c with a total mass of 52.5 g are combined with 160 g of water at 90 ∘c in an insulated container.
    8·2 answers
  • The hybridization associated with the central atom of a molecule in which all the bond angles are 180° is ____.
    13·1 answer
  • What do we call the set of compounds that are on the left of the reaction arrow
    11·2 answers
  • Which answer provides the correct name for the following hydrocarbon?
    13·2 answers
  • Uestion 1
    10·1 answer
  • Compared to our solar system, the universe is
    5·1 answer
  • Why can’t straw be made into gold
    11·2 answers
  • What is the wavelength of a wave that has a speed of 350 meters/second and a frequency of 140 hertz? __________ meters
    13·2 answers
  • Aqueous solutions of lithium sulfate and calcium nitrate are mixed, forming the precipitate
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!