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The concentration of cholesterol (C27H46O) in blood is approximately 5.0 mM. How many grams of cholesterol are in 250 mL of blood?
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Ch.9 Solutions
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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TOC.tableOfContents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Capitolo 9, Problema 11
The maximum amounts of lead and copper allowed in drinking water are 0.015 mg/kg for lead and 1.3 mg/kg for copper. Express these values in parts per million, and tell the maximum amount of each (in grams) allowed in 100 g of water.
Guida verificata passo dopo passo1
Step 1: Understand the relationship between parts per million (ppm) and mg/kg. Since 1 ppm is equivalent to 1 mg of solute per 1 kg of solution, the given values for lead (0.015 mg/kg) and copper (1.3 mg/kg) are already expressed in ppm. Therefore, lead is 0.015 ppm, and copper is 1.3 ppm.
Step 2: To find the maximum amount of lead allowed in 100 g of water, first convert the mass of water from grams to kilograms. Since 1 kg = 1000 g, 100 g of water is equivalent to 0.1 kg.
Step 3: Use the concentration of lead in ppm (0.015 ppm) to calculate the mass of lead in 0.1 kg of water. Multiply the concentration (in mg/kg) by the mass of water (in kg): \( \text{Mass of lead} = 0.015 \text{ mg/kg} \times 0.1 \text{ kg} \).
Step 4: Similarly, calculate the maximum amount of copper allowed in 100 g of water. Use the concentration of copper in ppm (1.3 ppm) and multiply it by the mass of water (in kg): \( \text{Mass of copper} = 1.3 \text{ mg/kg} \times 0.1 \text{ kg} \).
Step 5: Convert the calculated masses of lead and copper from milligrams to grams. Since 1 mg = 0.001 g, divide the results from Steps 3 and 4 by 1000 to express the masses in grams.
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Parts Per Million (PPM)
Parts per million (PPM) is a unit of measurement used to describe the concentration of a substance in a solution. It indicates how many parts of a substance are present in one million parts of the total solution. For example, 1 PPM means 1 milligram of a substance in 1 liter of water, which is equivalent to 1 mg/kg in terms of concentration.
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Percorso guidato
01:38
Parts per Million (ppm) Concept 1
Conversion from mg/kg to PPM
The conversion from milligrams per kilogram (mg/kg) to parts per million (PPM) is straightforward, as 1 mg/kg is equal to 1 PPM. This equivalence arises because 1 kilogram of water is approximately equal to 1 liter, making the two units interchangeable in the context of water solutions.
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Percorso guidato
01:38Parts per Million (ppm) Concept 1
Calculating Maximum Allowable Amounts
To find the maximum allowable amounts of lead and copper in grams for a specific volume of water, you can use the concentration values in PPM. For 100 g of water, you multiply the concentration (in PPM) by the mass of the water (in grams) and then convert from milligrams to grams, as there are 1000 mg in a gram.
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01:10Calculating Molar Mass
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The Environmental Protection Agency has set the limit for arsenic in drinking water at 0.010 ppm. To what volume would you need to dilute 1.5 L of water containing 5.0 ppm arsenic to reach the acceptable limit?
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Which of the following pairs of substances would you expect to form solutions?
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The typical concentration of Mg2+ in blood is 3 mEq/L. How many milligrams of Mg2+ are in 250 mL of blood?
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A solution is prepared by dissolving 12.5 g of KBr in 20 mL of water at 60 °C (see Figure 9.3). Is this solution saturated, unsaturated, or supersaturated? What will happen if the solution is cooled to 10 °C?
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