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Darina [25.2K]
3 years ago
14

Explain how you determine the number of valence electrons that should be used in the dot structure for silicon dioxide and state

the shape of the molecule.
Chemistry
1 answer:
anzhelika [568]3 years ago
5 0

Answer:

The electrons in the outermost shell are used to determine the dot structure.

Explanation:

According to Lewis, the structure of a molecule could be determined by accurately determining the number of electrons on the outermost shell of the Central atom. Silicon has four valence electrons on its outermost shell and it is the central atom in silicon dioxide. Silicon dioxide is a linear molecule as it forms two double bonds with oxygen.

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Answer:

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Explanation:

For NaOH :-

Given mass = 90.0 g

Molar mass of NaOH = 39.997 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{90.0\ g}{39.997\ g/mol}

Moles\ of\ NaOH= 2.2502\ mol

Molarity is defined as the number of moles present in one liter of the solution. It is basically the ratio of the moles of the solute to the liters of the solution.

The expression for the molarity, according to its definition is shown below as:

Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}

Where, Volume must be in Liter.

It is denoted by M.

Given, Volume = 3.00 L

So,

Molarity=\frac{2.2502\ mol}{3.00\ L}=0.75\ M

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