An ionic compound in the solid state has a defined, repeating arrangement of atoms, which is called
A) crystal lattice.
B) atomic structure.
C) electronic structure.
D) molecular structure.

A) Crystal lattice

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Molarity is moles of solute over liters of solution. idk if that is what you are talking about, but you can convert moles of solute to grams of solute using dimensional analyzes by using molar mass found on the periodic table.