Which three elements seem to make up so much of the world around us?
1 answer:
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The percent by mass of calcium hydroxide in the solution : 15.41%
<h3>Further explanation</h3>The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
Mass of solute (Ca(OH₂-Calcium hydroxide) : 28.5
Mass of solution = 185 g
Answer : The number of single bonds, double bonds, triple bonds, and unshared pairs of electrons on the central atom are, 3, 0, 0 and 0 respectively.
Explanation :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.
In the Lewis-dot structure the valance electrons are shown by 'dot'.
The given molecule is,
As we know that boron has '3' valence electrons and chlorine has '7' valence electrons.
Therefore, the total number of valence electrons in = 3 + 3(7) = 24
According to Lewis-dot structure, there are 6 number of bonding electrons and 18 number of non-bonding electrons.
From the Lewis-dot structure we conclude that,
The number of single bonds, double bonds, triple bonds, and unshared pairs of electrons on the central atom are, 3, 0, 0 and 0 respectively.
