The answer is (3) moles of solute per liter of solution. That is what the definition of molarity of a solution means. The equation is concentration = mol number of solute/ volume of solution.
Scientists change the independent variable; The dependent variable is the one that reacts to the independent variable.
The chemical symbol for sodium is Na
The reagent in the chemical reaction which oxidizes other reactants but itself reduces are called oxidizing agent.
Hope this helps, ask doubt in comment section below if you have one.
