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bezimeni [28]
3 years ago
10

Determine the identity of the daughter nuclide from the electron capture by 84be.

Chemistry
1 answer:
anyanavicka [17]3 years ago
7 0
Answer:
8  Li3

Explanation:

1) Electrons are called beta radiation (β)

2) Electrons are considered massless and with 1 negative charge, so in the nuclear reactions they are written as:
 0   e-1

Which means that they do not change the mass number of the isotope but reduces its atomic number in 1.

2) Then, the capture of one electron by berylium-8 means that it will reduce its atomic number in one unit and while its mass number will be the same.

3) The given isotope is:
 8
    Be  4


4) Then the resultant daughter will have the same mass number (8) and aomic number 3.

The element with atomic number 3 is Li, so it will be:

8  Li3


5) The total nuclear reaction is:

8               0         8
  Be + 1      e →     Li
4              -1         3

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Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g kno3 and 295 ml of water. The density of water
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Answer:  the percent by mass of potassium nitrate is 13.3%

Explanation:

<u>1) Data:</u>

  • Mass of solute, m₁ = 45.0 g
  • Volume of solvent, V₂ = 295 ml
  • density of water, d₂ = 0.997 g/ml

<u>2) Formulae</u>:

  • Percent by mass, % = (mass of solute / mass of solution) × 100

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  • The answer has to be reported with 3 significant figures.
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