What is true of an aqueous solution that is 15.0 percent HNO3 by mass?

It contains 15.0 grams of HNO3 per 1.0 liter of water.

It contains 15.0 grams of HNO3 per 100 grams of solution.

It contains 15.0 moles of HNO3 per 100 moles of water.

It contains 15.0 moles of HNO3 per 1.0 liter of solution.

It contains 15.0 grams of HNO₃ per 100 grams of solution.

Explanation:

To calculate the mass percent or weight percent of a solution, you must divide the mass of the solute by the mass of the solution (both the solute and the solvent together) and then multiply by 100 to change it into percent.

W% = [ (W of solute) / (W of solution) ] x 100.

So, Every 100.0 g of the solution contains 15.0 g of HNO₃.