A decrease in the temperature of a contained liquid causes
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This is an incomplete question, here is a complete question.
Draw a Lewis structure for H₂O that obeys the octet rule if possible and answer the following questions based on your drawing.
For the central oxygen atom:
The number of lone pairs =
The number of single bonds =
The number of double bonds =
Answer : The Lewis structure for H₂O is shown below.
For the central oxygen atom:
The number of lone pairs = 4
The number of single bonds = 2
The number of double bonds = 0
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 representation of valence electrons of an atom by dots around the symbol of an element is said to be the Lewis-dot symbol.
In the representation of Lewis-symbol, one electron dot must put on each side of the element symbol then paired the electrons.
The given molecule is,
As we know that hydrogen has '1' valence electrons and oxygen has '6' valence electrons.
Therefore, the total number of valence electrons in = 2(1) + 6 = 8
According to Lewis-dot structure, there are 4 number of bonding electrons and 4 number of non-bonding electrons.
For the central oxygen atom:
The number of lone pairs = 4
The number of single bonds = 2
The number of double bonds = 0
Given :
Number of molecules of hydrogen peroxide, N = 4.5 × 10²².
To Find :
The mass of given molecules of hydrogen peroxide.
Solution :
We know, 1 mole of every compound contains Nₐ = 6.022 × 10²³ molecules.
So, number of moles of hydrogen peroxide is :
Now, mass of hydrogen peroxide is given as :
m = n × M.M
m = 0.0747 × 34 grams
m = 2.54 grams
Hence, this is the required solution.