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
suter [353]
3 years ago
9

A rock sample contains 4.5g of Potassium-40 and 31.5g of its daughter isotope (Argon-40). How old is the rock sample if Potassiu

m-40 has a half-life of 1.3 billion years?
Chemistry
1 answer:
brilliants [131]3 years ago
8 0
<span>There is a starting mass of 36g of Potassium-40. After 1.3 billion years, there would be 18g of Argon-40. After 2.6 billion years, half of the remaining Potassium-40 would have decayed, leaving 9g of Potassium-40 and giving us 27g of Argon-40. Following this pattern, we see that three half-lives, or 3.9 billion years, have passed. The age of the rock sample is 3.9 billion years.</span>
You might be interested in
You need 1.2 moles of H2SO4 for an experiment. You weigh out 100g of this colorless syrupy liquid. Do you have enough?
Sladkaya [172]
Answer is: not enough <span>colorless syrupy liquid.
</span>n(H₂SO₄) = 1,2 mol.
M(H₂SO₄) = 2Ar(H) + Ar(S) + 4Ar(O) · g/mol.
M(H₂SO₄) = 2·1 + 32 + 4·16 · g/mol.
M(H₂SO₄) = 98 g/mol.
m(H₂SO₄) = n(H₂SO₄) · M(H₂SO₄).
m(H₂SO₄) = 1,2 mol · 98 g/mol.
m(H₂SO₄) = 117,6 g needed.
100 g is less that 117,6 g.
8 0
4 years ago
What is love and why are people scared to show love even if they like boys or girls
myrzilka [38]
Because society has shaped our mind on what we shall think about things
6 0
4 years ago
Read 2 more answers
Describe the difference between a ball-and-stick model and a space-filling model of a compound.
Lisa [10]
A space-filling model shows the relative amount of space each atom takes up. In other words, a space-filling model can show relative sizes of atoms. However, unlike ball-and-stick or structural models, space-filling models do not show bond lengths clearly. Bonds are not really like sticks in a ball-and-stick model.
4 0
3 years ago
What is the correct name of the compound Mn3(PO4)2? A. manganese phosphate B. manganese(I) phosphate C. manganese(III) phosphate
Sergio039 [100]
The correct name of the compound Mn3(PO4)2 is  definitely the last option represented above <span>D. manganese(II) phosphate. I am pretty sure this answer will help you

</span><span>
</span>
3 0
3 years ago
Can you help me please
irina [24]

Answer:

Concentrated solutions

7 0
3 years ago
Other questions:
  • What combines to form bonds in compounds? A. atoms of elements B. molecules C. types of minerals D. valences
    10·1 answer
  • What property of an atom determines its general reactivity
    10·1 answer
  • A voltaic cell utilizes the following reaction: 4Fe2+(aq)+O2(g)+4H+(aq)→4Fe3+(aq)+2H2O(l).
    5·1 answer
  • Which best identifies why the rusting of an iron nail in the presence of water and oxygen is an oxidation-reduction reaction?
    6·1 answer
  • A positively charged particle is placed next to an negatively charged object. In which direction does the positively charged par
    6·1 answer
  • PLEASE HELP!! What is the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water? 26.5% 2
    13·1 answer
  • What is a change in the arrangement of bases in a gene called?????
    14·2 answers
  • The motion of this wave vibrates up and down.
    13·1 answer
  • Explain how a common housecat gets “worms.” <br><br> No google or else i report you.
    10·1 answer
  • What is the ratio of hydrogen molecules to ammonia molecules<br> in the following reaction
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!