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1.72 moles/liter

Molarity = Number of moles of solute ÷ Volume of the solution

In this case;

Mass of the solute = 46.0 g

Volume of the solution = 500.0 mL or 0.5 L

To calculate the molarity;

First, calculate the number of moles of the solute

Moles = Mass ÷ Molar mass

Molar mass of solute, NH₄Cl = 53.491 g/mol

Therefore;

Moles of the solute = 46.0 g ÷ 53.491 g/mol

                               = 0.860 moles

Second, we calculate the molarity of the solution;

Using the formula;

Molarity = Moles of solute ÷ Volume of solution

             = 0.860 moles ÷ 0.5 L

             = 1.72 Moles/liter or 1.72 M

Thus, the concentration of the solution is 1.72 moles/liter