3 years ago

How many valence electrons are in an atom of phosphorus? (atomic number 15) (1 point)?

1 answer:

5 0

There are 5 valence electrons in a atom of phosphorus.

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Reika [66]

Answer: I believe it's C

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ki77a [65]

Potassium is the simplest form of matter and therefore can not be broken down by chemical change.

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boyakko [2]

Answer: The answer to the first one is the second option and the answer for the second one is the first option.

Explanation:

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Darina [25.2K]

Answer: There are 7.4 moles of helium gas present in a 1.85 liter container at the same temperature and pressure.

Explanation:

Given: $V_{1}$ = 2.25 L, $n_{1}$ = 9.0 mol

$V_{2}$ = 1.85 L, $n_{2}$ = ?

Formula used to calculate the moles of helium are as follows.

$\frac{V_{1}}{n_{1}} = \frac{V_{2}}{n_{2}}\\$

Substitute the values into above formula as follows.

$\frac{V_{1}}{n_{1}} = \frac{V_{2}}{n_{2}}\\\frac{2.25 L}{9.0 mol} = \frac{1.85 L}{n_{2}}\\n_{2} = \frac{1.85 L \times 9.0 mol}{2.25 L}\\= 7.4 mol$

Thus, we can conclude that there are 7.4 moles of helium gas present in a 1.85 liter container at the same temperature and pressure.

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Anuta_ua [19.1K]

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