Complete Question
The complete question is shown on the first uploaded image
Answer:
The initial concentration is 
Explanation:
From the question we are told that
The volume of solution A is 
The concentration of A is 
The volume of solution B is 
The volume of water is 
Generally the law of dilution is mathematically represented as
Where 
is the concentration of the mixture
is the volume of the mixture which is mathematically evaluated as
So
substituting values
Note the mixture obtained is 
The pH of the salts in decreasing order is FeCl2, FeCl3, MgCl2, KClO2.
What is pH?
pH is an expression of hydrogen ion concentration in water. Specifically, pH is the negative logarithm of hydrogen ion (H+) concentration (mol/L) in an aqueous solution:
pH = -log10(H+)
The term is used to indicate basicity or acidity of a solution on a scale of 0 to 14, with pH 7 being neutral.
As the concentration of H+ ions in solution increases, acidity increases and pH gets lower, below 7. When pH is above 7, the solution is basic.
Because pH is a logarithmic function, one unit change in pH indicates a 10x change in H+ concentration in that solution.
However, what is actually measured is hydrogen ion activity, not concentration.
To learn more about pH: brainly.com/question/13982975 #SPJ4
The total reaction energy calculated by reactant bond energy - product
bond energy
The reactant bond energy is usually higher than that of the product bond
energy. This is as a result of the bonds in the product having higher bond
energy than the reactants.
<h3>What is Total reaction energy?</h3>
The total reaction energy is therefore calculated by subtracting the product
bond energy from the reactant bond energy so as to know the net energy
which was used in the reaction.
Read more about Reaction energy here brainly.com/question/24722308
Answer:
atom is the smallest indivisible particle of an element
Explanation:
The symbol of 20 element are H He li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca
element is the simplest pure form of a substance .
Explanation:
1)Mass of CO when 210.3 g of Fe produced.
Number of moles of 
in 210.3 g=
According to reaction, 2 moles of Fe are obtained from 3 moles of CO, then 3.76 moles of Fe will be obtained from : 
of CO that is 5.64 moles.
Mass of CO in 5.64 moles =
2)Mass of CO when 209.7 g of Fe produced.
Number of moles of in 209.7 g=
According to reaction, 2 moles of Fe are obtained from 3 moles of CO, then 3.75 moles of Fe will be obtained from : 
of CO that is 5.625 moles.
Mass of CO in 5.625 moles =
