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3 years ago

The energy needed to remove an electron from an atom is called __________ energy.

Chemistry

2 answers:

MariettaO [177]3 years ago

8 0

<span>The energy needed to remove an electron from an atom is called ionization energy.</span>

aev [14]3 years ago

3 0

Answer: ionization

Explanation:

Ejection of electrons occur when incident light of frequency greater than threshold frequency falls on a metal, the electrons are ejected from metal.

Ionization is the amount of energy requires to remove the most loosely bound electron from an isolated gaseous atom

Valence is the outermost shell which contains the most loosely bound electron.

Electronegativity is the tendency of an atom to attract the shared pair of electrons towards itself.

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2 years ago

Suppose you have a sample of table salt (NaCl) that has a mass of 100.0 grams. If

IgorC [24]

Taking into account the definition of molarity, the concentration of the solution is 0.855 $\frac{moles}{liter}$ .

<h3>Definition of molarity</h3>

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

$Molarity=\frac{number of moles}{volume}$

Molarity is expressed in units $\frac{moles}{liter}$ .

<h3>Molarity of NaCl</h3>

In this case, you have:

number of moles of NaCl= $100 grams\frac{1 mole}{58.45 grams} =$ 1.71 moles (being 58.45 g/mole the molar mass of NaCl)
volume 2 L

Replacing in the definition of molarity:

$Molarity=\frac{1.71 moles}{2 L}$

Solving:

Molarity= 0.855 $\frac{moles}{liter}$

Finally, the concentration of the solution is 0.855 $\frac{moles}{liter}$ .

Learn more about molarity:

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