Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

6. Chemical Reactions & Quantities

Mole Concept

GOB Chemistry

6. Chemical Reactions & Quantities

Mole Concept

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1:51 minutes

Problem 22d

Textbook Question

Calculate the mass, in grams, for each of the following:
d. 0.145 mole of C₂H₆O

Verified step by step guidance

Step 1: Identify the molecular formula of the compound. In this case, the molecular formula is C₂H₆O, which represents ethanol.

Step 2: Calculate the molar mass of C₂H₆O by summing the atomic masses of its elements. Use the periodic table to find the atomic masses: Carbon (C) = 12.01 g/mol, Hydrogen (H) = 1.008 g/mol, and Oxygen (O) = 16.00 g/mol. The molar mass is calculated as:

2 \cdot 12.01 + 6 \cdot 1.008 + 16.00

g/mol.

Step 3: Write the relationship between moles and mass using the formula:

mass = moles \cdot molar mass

. Here, the number of moles is given as 0.145 moles.

Step 4: Substitute the values into the formula. Use the molar mass calculated in Step 2 and the given number of moles (0.145 moles) to find the mass:

mass = 0.145 \cdot molar mass

Step 5: Perform the multiplication to calculate the mass in grams. Ensure the units cancel appropriately, leaving the final answer in grams.

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Key Concepts

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

Mole Concept

The mole is a fundamental unit in chemistry that quantifies the amount of substance. One mole corresponds to 6.022 x 10²³ entities, such as atoms or molecules. Understanding the mole concept is essential for converting between the number of particles and mass, as it provides a bridge between the microscopic and macroscopic worlds.

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 masses of all atoms in a molecule. For C₂H₆O, the molar mass is crucial for determining the mass of a given number of moles, allowing for conversions between moles and grams.

Mass Calculation

To calculate the mass of a substance from moles, the formula used is: mass (g) = moles × molar mass (g/mol). This relationship allows chemists to determine how much of a substance is present based on its quantity in moles. Applying this formula to the given moles of C₂H₆O will yield the required mass in grams.