Ions are atoms or groups of atoms that have either gained or lost electrons
4.33898305 is the density
Divide mass/volume
If we looks at the elements and the periodic table . A is correct because Nitrogen is N , Ensteinium is E, Radon is RN, and lastly S is sulfer.
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Answer:
of the stock solution would be required.
Explanation:
Assume that a solution of volume 
contains a solute with a concentration of 
. The quantity 
of that solute in this solution would be:
.
For the solution that needs to be prepared, 
. The volume of this solution is 
. Calculate the quantity of the solute (magnesium chloride) in the required solution:
.
Rearrange the equation to find an expression of volume , given the concentration and quantity of the solute:
.
Concentration of the solute in the stock solution: 
.
Quantity of the solute required: 
.
Calculate the volume of the stock solution that would contain the required of the magnesium chloride solute:
.
