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3 years ago

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

1 answer:

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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Answer:
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1.566 g Zn x (1 mole Zn / 65.38 g Zn) = 0.02395 moles Zn
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Now use the ideal gas law to find the volume V.
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3 years ago

The molecular weight of a gas that has a density of 5.75 g/l at stp is __________ g/mol.

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Answer : The molecular weight of a gas is, 128.9 g/mole

Explanation : Given,

Density of a gas = 5.75 g/L

First we have to calculate the moles of gas.

At STP,

As, 22.4 liter volume of gas present in 1 mole of gas

So, 1 liter volume of gas present in $\frac{1}{22.4}=0.0446$ mole of gas

Now we have to calculate the molecular weight of a gas.

Formula used :

$\text{Moles of gas}=\frac{\text{Mass of a gas}}{\text{Molecular weight of a gas}}$

Now put all the given values in this formula, we get the molecular weight of a gas.

$0.0446mole=\frac{5.75g}{\text{Molecular weight of a gas}}$

$\text{Molecular weight of a gas}=128.9g/mole$

Therefore, the molecular weight of a gas is, 128.9 g/mole

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