An aqueous KNO3 solution is made using 74.0 g of KNO3 diluted to a total solution volume of 2.06 L. what is the mass percent

The mass % of KNO3 in the solution is 3.42 %

Explanation:

An aqueous KNO3 solution is made using 74.0 g of KNO3 diluted to a total solution volume of 2.06 L. what is the mass percent

Assume a density of 1.05g/mL for the solution.

Step 1: Data given

Mass of KNO3 = 74.0 grams

Volume = 2.06 L

Molar mass of KNO3 = 101.10 g/mol

Step 2: Calculate mass of the solution

Mass solution = volume * density

Mass solution = 2060 mL * 1.05 g / mL

Mass solution = 2163 grams

Step 3: Calculate mass of H2O

Mass H2O = mass solution - mass KNO3

Mass H2O = 2163 grams - 74.0 grams

Mass H2O = 2089 grams H2O

Step 4: Calculate mass % of KNO3

% KNO3 = (mass KNO3 / mass solution) * 100%

% KNO3 = (74.0 / 2163 grams) * 100%

% KNO3 = 3.42%

The mass % of KNO3 in the solution is 3.42 %