Answer:
The mass % of KNO3 in the solution is 3.42 %
Step-by-step 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 %