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Marina CMI [18]
4 years ago
6

a 160 milligram sample of a radioactive isotope decays to 10 kilograms in 12 years. what is the half life of this element

Chemistry
1 answer:
Shkiper50 [21]4 years ago
8 0

Answer:

3 years

Explanation:

Given data:

Initial amount of sample = 160 Kg

Amount left after 12 years = 10 Kg

Half life = ?

Solution:

at time zero = 160 Kg

1st half life = 160/2 = 80 kg

2nd half life = 80/2 = 40 kg

3rd half life = 40 / 2 = 20 kg

4th half life = 20 / 2 = 10 kg

Half life:

HL = elapsed time / half life

12 years / 4 = 3 years

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vichka [17]

Answer:

5.0 moles.

Explanation:

  • The balanced equation of the reaction between hydrogen and oxgen to produce water is:

<em>H₂ + 1/2O₂ → H₂O.</em>

  • It is clear that 1.0 mole of H₂ reacts with 0.5 mole of O₂ to produce 1.0 mole of  H₂O.

∴ 2.5 mole of O₂ will react with 5.0 moles of H₂.

  • The limiting reactant is O₂ and H₂ is found in excess (1.0 mole more).

From the stichiometry: 2.5 mole of O₂ will react with 5.0 moles of H₂ to produce 5.0 moles of  H₂O.

<em>∴ 5.0 moles of water are produced when 6.0 moles of hydrogen gas react with 2.5 moles of oxygen gas</em>

7 0
3 years ago
An atom of zinc that contains 30 protons and 38 neutrons would be named what
julia-pushkina [17]

Answer:

Explanation:

30+38

so this is the isosotope of Zn  that weighs 68

-so Zn68

6 0
3 years ago
What type of molecule is acetylacetone?
Vlada [557]

Answer:

c. ketone

Explanation:

the answer is ketone

6 0
2 years ago
Crude oil may contain hundreds of different types of hydrocarbons. Some examples include: Butane(C4H10) Dodecane (C12H26) Octane
Klio2033 [76]

Answer:

The answer to your question is below

Explanation:

Material             Classification               Reason

Crude oil             Mixture                         Because we know that crude oil

                                                                 is composed of different substances.

Butane                Compound                   Because it is composed of carbon

                                                                 and hydrogen

Dodecane           Compound                  Because it is composed of carbon

                                                                and hydrogen.

Octane                Compound                  Because it is composed of carbon and

                                                                 hydrogen.

Benzene              Compound                  It is also composed of carbon and

                                                                 hydrogen.

Gasoline              Mixture                         It is a combination of hydrocarbons

Kerosene             Mixture                        It is a combination of hydrocarbons

Oxygen                Element                       We can find it in the periodic table.

Carbon dioxide   Compound                   It is composed of carbon and oxygen.

Water                   Compound                   It is composed of hydrogen and        

                                                                  oxygen.

8 0
4 years ago
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Why are salt and sugar both able to dissolve in water, even though the solutes have different types of chemical bonding?
Feliz [49]

Answer:

See explanation

Explanation:

A substance is only soluble in water if it is composed of ions or polar groups which are capable of interaction with water.

Salt is composed of ions which are easily solvated by the dipoles of water molecule. Sucrose is composed of polar groups capable of interaction with water. This accounts for the solubility of sucrose (sugar) in water. Sugar is a covalent molecule but is composed of polar groups while salt is composed of ionic bonds.

Hence salt and sugar are both soluble in water for the reasons described above.

4 0
3 years ago
Read 2 more answers
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