Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

2. Cell Chemistry & Cell Components

Carbohydrates

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Carbohydrates

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2:55 minutes

Problem 17

Textbook Question

How many moles of aspirin, C₉H₈O₄, are in a bottle containing 450 g by weight? (Note: The approximate atomic weights of its atoms are C = 12, H = 1, and O = 16.)

Verified step by step guidance

Step 1: Calculate the molar mass of aspirin (C₉H₈O₄). To do this, sum the atomic weights of all the atoms in the molecular formula. Use the approximate atomic weights provided: Carbon (C) = 12, Hydrogen (H) = 1, and Oxygen (O) = 16. The molar mass is calculated as follows: (9 × 12) + (8 × 1) + (4 × 16).

Step 2: Once the molar mass of aspirin is determined, use the formula for moles: moles = mass (g) / molar mass (g/mol). Substitute the given mass of aspirin (450 g) and the molar mass calculated in Step 1 into this formula.

Step 3: Perform the division to determine the number of moles of aspirin in the bottle. Ensure the units cancel appropriately, leaving the result in moles.

Step 4: Verify your calculation by checking the molar mass and ensuring the division was performed correctly. Double-check the atomic weights and the molecular formula to avoid errors.

Step 5: Interpret the result in the context of the problem. The calculated moles represent the quantity of aspirin molecules in the bottle, which can be useful for further chemical or physiological calculations.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic weights of all atoms in a molecule. For aspirin (C₉H₈O₄), the molar mass is determined by multiplying the number of each type of atom by its atomic weight and adding these values together.

Moles

A mole is a unit of measurement in chemistry that represents 6.022 x 10²³ entities, such as atoms or molecules. It allows chemists to count quantities of substances in a manageable way. The number of moles can be calculated by dividing the mass of the substance by its molar mass, providing a direct relationship between mass and the number of particles.

Stoichiometry

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. It involves using balanced chemical equations to calculate the amounts of substances consumed and produced. In this context, stoichiometry helps determine how many moles of aspirin are present based on its mass and molar mass.

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Textbook Question

Which of the following molecules is an inorganic molecule?

a. Sucrose

b. Cholesterol

c. Collagen

d. Sodium chloride

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Textbook Question

A triglyceride consists of:

a. Glycerol plus three fatty acids

b. A sugar-phosphate backbone to which two amino groups are attached

c. Two to several hexoses

d. Amino acids that have been thoroughly saturated with hydrogen

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The lipid(s) used as the basis of vitamin D, sex hormones, and bile salts is/are:

a. Triglycerides

b. Cholesterol

c. Phospholipids

d. Prostaglandin

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A chemist, during the course of an analysis, runs across a chemical composed of carbon, hydrogen, and oxygen in the proportion 1:2:1 and having a six-sided molecular shape. It is probably:

a. A pentose

b. An amino acid

c. A fatty acid

d. A monosaccharide

e. A nucleic acid

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Textbook Question

Glucose is to starch as:

a. A steroid is to a lipid

b. A nucleotide is to a nucleic acid

c. An amino acid is to a protein

d. A polypeptide is to an amino acid