text: Molarity = Mols/ V (L)\n\nFirst find out how many moles you have in your sample. The molar mass for HCl is 1 + 35.5 = 36.5 g/mol\n\n4.25 g / 36.5 g/mol = 0.1164 mols HCl\n\nNext change mL to L 28.2/1000 = 0.028 L\n\nM=0.1164/0.02828\nM = 4.129 M