An aqueous KNO3 solution is made using 55.3 g of KNO3 diluted to a total solution volume of 2.00 L. Calculate the molality of the solution. (Assume a density of 1.05 g>mL for the solution.)
Ch.14 - Solutions
Chapter 14, Problem 62
A dioxin-contaminated water source contains 0.085% dioxin by mass. How much dioxin is present in 2.5 L of this water? Assume a density of 1.00 g/mL.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Concentration by Mass
Concentration by mass refers to the amount of solute (in this case, dioxin) present in a given mass of solution. It is often expressed as a percentage, indicating how many grams of solute are present in 100 grams of solution. Understanding this concept is crucial for calculating the mass of dioxin in a specific volume of contaminated water.
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Density
Density is defined as mass per unit volume and is a key property of substances. In this scenario, the density of the water is given as 1.00 g/mL, which means that 1 mL of water has a mass of 1 gram. This information allows us to convert the volume of water (2.5 L) into mass, which is necessary for calculating the total mass of dioxin present.
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Volume to Mass Conversion
To find the mass of a substance from its volume, we use the formula: mass = volume × density. In this case, converting 2.5 L of water to grams using the provided density allows us to determine the total mass of the water, which is essential for applying the concentration percentage to find the mass of dioxin present in the water.
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Related Practice
Textbook Question
Textbook Question
An aqueous KNO3 solution is made using 55.3 g of KNO3 diluted to a total solution volume of 2.00 L. Calculate the mass percent of the solution. (Assume a density of 1.05 g>mL for the solution.)
Textbook Question
To what volume should you dilute 50.0 mL of a 3.00 M KI solution so that 25.0 mL of the diluted solution contains 2.55 g of KI?
Textbook Question
Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0011% Pb by mass. How much of the water (in mL) contains 150 mg of Pb? (Assume a density of 1.0 g/mL.)
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Textbook Question
Describe how to prepare each solution from the dry solute and the solvent. b. 125 g of 0.100 m NaNO3
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Textbook Question
Describe how to prepare each solution from the dry solute and the solvent. c. 125 g of 1.0% NaNO3 solution by mass
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