<span>There
are a number of ways to express concentration of a solution. This includes
molarity. Molarity is expressed as the number of moles of solute per volume of
the solution. Therefore, the molarity of the given solute in the solution is:
Molarity = 5 moles / 2 L = 2.5 moles / L</span>
Answer:
There are 23 electrons in Fe3+
I think the answer is B. Because
S will fill first in the third energy level