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
Ierofanga [76]
3 years ago
14

Potassium has a half-life of 12 hours. What fraction of a 100g sample is left after 48 hours

Biology
1 answer:
EastWind [94]3 years ago
4 0

Answer:

After 48 hours amount left = 6.25 g

Explanation:

Given data:

Half life of potassium = 12 hours

Total mass = 100 g

Mass left after 48 hours = ?

Solution:

Number of half lives passed:

Number of half lives = Time elapsed / half life

Number of half lives = 48 hours/ 12 hours

Number of half lives = 4

At time zero = 100 g

At first half life = 100 g/ 2 = 50 g

At 2nd half life = 50 g/2 = 25 g

At 3rd half life = 25 g/2 = 12.5g

At 4th half life = 12.5 g/2 = 6.25 g

You might be interested in
Which of the following words best describes the nature of scientific knowledge?
andrey2020 [161]
Evolving. because science is always finding new things everyday and is discovering how things become more things. that is basically evolution.
3 0
3 years ago
What does biology mean?​
Vanyuwa [196]

Answer:

the study of life

Explanation:

bio- life

logy- the study of

5 0
3 years ago
Read 2 more answers
Determine how tRNA is used when cells build proteins ...?
alexdok [17]
<span>tRNA carries a single amino acid to the ribosome. 
It fits the codon on the mRNA in the ribosome with it's anti-codon. 

The ribosome has peptidyl-transferase activity which catalyses the peptide bond between 2 amino acids on 2 tRNAs in the ribosome. 

One tRNA is released and then picks up another amino acid depending on its anti-codon.


I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
</span>
3 0
3 years ago
For a given species, an increased evolutionary rate would cause a decrease in A) biodiversity. B) fitness of a species. C) simil
Serggg [28]
A. Biodiversity is the answer

7 0
3 years ago
Read 2 more answers
Which is an example of circadian rhythm in plants?
umka21 [38]
A the flowering of the four oclock plant at the same time
8 0
3 years ago
Read 2 more answers
Other questions:
  • In a deciduous forest ecosystem which of these organisms would be a decomposer
    7·1 answer
  • Most enzymes are _____. most enzymes are _____. nucleic acids proteins minerals lipids carbohydrates
    12·2 answers
  • Based on the passage, which of the following is correct?
    6·1 answer
  • Look at the branching tree diagram below.
    12·1 answer
  • A difference between miocene apes and modern apes is the
    14·1 answer
  • If a chemical reaction catalyzed by an enzyme is being carried out, and there is a sudden, drastic decrease in temperature, what
    6·2 answers
  • The growth in the global Ecological Footprint since 1961 is largely a result of an increase in global carbon footprint. As fossi
    12·1 answer
  • . Which of the following occurs over a small area? polar easterlies o the Coriolis effect O horse latitudes O sea breezes​
    10·1 answer
  • Como concientizar a las personas sobre la manera de usar el agua correctamente?
    14·1 answer
  • I will give Brainliest!
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!