What is the correct way to find the molarity of an aqueous solution?

Molarity is given by,
Molarity = number of moles of solute
                 
                   volume of the solution(in liters)

In order to find molarity, you need to find first moles of solute which can be found by,

Number of moles = mass of that substance
                               
                           atomic weight of element/molar mass of that compound

Volume of the solution will be provided to you in the question.

Once you know volume of the solution and number of moles, plug these values in above molarity formula.

The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 atoms, molecules, or formula units of that substance.

Answer//the law of conservation of mass.;