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Caffeine has the formula C8H10N4O2. If an average cup of coffee contains approximately 125 mg of caffeine, how many moles of caffeine are in one cup?
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Ch.6 Chemical Reactions: Mole and Mass Relationships
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
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McMurry 8th EditionCh.6 Chemical Reactions: Mole and Mass RelationshipsProblema 22
McMurry 8th EditionCh.6 Chemical Reactions: Mole and Mass RelationshipsProblema 22Capitolo 6, Problema 22
How many Na+ ions are in a mole of Na2SO4? How many SO42- ions?
Guida verificata passo dopo passo1
Step 1: Understand the chemical formula of sodium sulfate (Na₂SO₄). It consists of 2 sodium ions (Na⁺) and 1 sulfate ion (SO₄²⁻) per formula unit.
Step 2: Recall that 1 mole of any substance contains Avogadro's number of particles, which is approximately 6.022 × 10²³ particles/mole.
Step 3: Determine the number of Na⁺ ions in 1 mole of Na₂SO₄. Since each formula unit of Na₂SO₄ contains 2 Na⁺ ions, multiply Avogadro's number by 2 to find the total number of Na⁺ ions in 1 mole of Na₂SO₄.
Step 4: Determine the number of SO₄²⁻ ions in 1 mole of Na₂SO₄. Each formula unit of Na₂SO₄ contains 1 SO₄²⁻ ion, so the total number of SO₄²⁻ ions in 1 mole of Na₂SO₄ is equal to Avogadro's number.
Step 5: Summarize the results: Multiply Avogadro's number by the respective counts of Na⁺ and SO₄²⁻ ions per formula unit to find the total number of each ion in 1 mole of Na₂SO₄.
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Mole Concept
The mole is a fundamental unit in chemistry that represents a specific quantity of particles, typically 6.022 x 10^23 entities, known as Avogadro's number. It allows chemists to count atoms, molecules, or ions in a given sample by relating mass to the number of particles. Understanding the mole concept is essential for converting between grams and moles, which is crucial for stoichiometric calculations.
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01:25
Mole Concept
Ionic Compounds
Ionic compounds are formed from the electrostatic attraction between positively charged ions (cations) and negatively charged ions (anions). In the case of Na2SO4, sodium (Na+) is the cation, and sulfate (SO4 2-) is the anion. The formula indicates that two sodium ions are present for every sulfate ion, which is key to determining the number of each type of ion in a mole of the compound.
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02:11Naming Ionic Compounds
Chemical Formula Interpretation
A chemical formula provides information about the types and ratios of atoms in a compound. For Na2SO4, the subscript '2' next to Na indicates that there are two sodium ions for every one sulfate ion. This interpretation is crucial for calculating the total number of ions in a mole of the compound, as it directly informs how many of each ion type are present.
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02:04Chemical Reaction: Chemical Change Concept 2
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