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Ch.14 - Solutions
Tro - Chemistry: A Molecular Approach 5th Edition
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Tutti i libri di testoTro 5th EditionCh.14 - SolutionsProblema 56
Capitolo 14, Problema 56

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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1
Convert the volume of water from liters to milliliters using the conversion factor: 1 L = 1000 mL.
Calculate the mass of the water using the density formula: \( \text{mass} = \text{density} \times \text{volume} \).
Determine the mass of dioxin in the water by using the percentage by mass: \( \text{mass of dioxin} = \text{mass of water} \times \frac{0.085}{100} \).
Ensure all units are consistent and check calculations for accuracy.
Summarize the steps and ensure understanding of the concept of percentage by mass and its application in this context.

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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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Atomic Mass

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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Density Concepts

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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Energy to Mass Conversion
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