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o-na [289]
3 years ago
10

Which electrons are the valence electrons of the atom

Chemistry
2 answers:
DaniilM [7]3 years ago
7 0
Negative electrons not sure that’s right haven’t did that in a while
ad-work [718]3 years ago
5 0

Explanation:

Valence electrons are those electrons found in the outermost shell of an atom. In other words, these are the electrons that can be gained or lost during a chemical reaction.

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0.120M is the concentration of the solution

Explanation:

<em>Assuming the mass of sodium nitrate dissolved was 2.552g</em>

<em />

Molar concentration is an unit of concentration widely used in chemsitry defined as the moles of solute (In this case NaNO3) in 1L of solution.

To find this question we must find the moles of NaNO3 in 2.552g. With this mass and the volume (250mL = 0.250L) we can find molar concentration as follows:

<em>Moles NaNO3 -Molar mass: 84.99g/mol-</em>

2.552g * (1mol / 84.99g) = 0.0300 moles NaNO3

<em>Molar concentration:</em>

0.0300 moles NaNO3 / 0.250L =

<h3>0.120M is the concentration of the solution</h3>
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