Question

An aqueous solution of nitric acid has a density of 1.084 g mL-1 and a measured concentration of 2.580 molar. What is the percent weight of nitric acid in the solution.

Answer 1

How much does a liter of solution weigh? It has a mass of 1.084 g/mL x 1000 mL = 1084 grams.
There are 2.580 moles HNO3 in the 1084 g of solution; therefore, 2.580 x molar mass HNO3 = about 162 g HNO3. (You need to do it exactly).
% HNO3 = (g HNO3/mass solution)*100 =
about (162/1084)*100 = ??
Check my work.