The density of an aqueous solution of nitric acid is 1.36 g/ml and the concentration is 2.48 m. what is the concentration of this solution in percent by mass?

Density is mass by volume

1 mL of nitric acid solution has a mass of 1.36 g

therefore 1000 mL has a mass of 1360 g

the molarity of solution is 2.48 mol/L

1 L of solution has 2.48 mol

the mass of 2.48 mol of HNO₃ is - 2.48 mol x 63 g/mol = 156.24 g

this means that 156.24 g of the solution consists of nitric acid

therefore percentage by mass - mass of nitric acid / total mass x 100%

concentration as percentage by mass = 156.24 g / 1360 g x 100%

percentage = 11.5%