Multiple Choice
An aqueous KNO3 solution is made using 71.6 g of KNO3 diluted to a total solution volume of 1.80 L. Assuming a density of 1.05 g/mL for the solution, what is the mass percent of KNO3 in the solution?
3. Chemical Reactions
Mass Percent
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What is the mass percent (m/m%) of a solution if 20 grams of solute is dissolved in 80 grams of solvent?
A
40%
B
25%
C
20%
D
30%
Verified step by step guidance1
Understand the concept of mass percent (m/m%). It is a way to express the concentration of a solution, defined as the mass of the solute divided by the total mass of the solution, multiplied by 100 to get a percentage.
Identify the given values: the mass of the solute is 20 grams, and the mass of the solvent is 80 grams.
Calculate the total mass of the solution by adding the mass of the solute and the mass of the solvent. Use the formula: .
Substitute the given values into the formula to find the total mass: .
Calculate the mass percent using the formula: . Substitute the values to find the mass percent.
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