Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

2. Atoms & Elements

Mole Concept

General Chemistry

2. Atoms & Elements

Mole Concept

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Multiple Choice

How do you calculate the number of moles of a diprotic acid if you have 0.1236 grams of it dissolved in 40 mL of water, given its molar mass is 61.04 g/mol?

Divide the mass of the acid by its molar mass.

Divide the volume of water by the molar mass of the acid.

Multiply the volume of water by the mass of the acid.

Multiply the mass of the acid by its molar mass.

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Verified step by step guidance

Step 1: Understand the concept of moles. The number of moles of a substance is calculated using the formula: \( \text{moles} = \frac{\text{mass}}{\text{molar mass}} \). This formula relates the mass of a substance to its molar mass, which is the mass of one mole of that substance.

Step 2: Identify the given values. You have the mass of the diprotic acid as 0.1236 grams and its molar mass as 61.04 g/mol. The volume of water is not directly needed for calculating moles in this context.

Step 3: Apply the formula for moles. Substitute the given values into the formula: \( \text{moles} = \frac{0.1236 \text{ g}}{61.04 \text{ g/mol}} \). This will give you the number of moles of the diprotic acid.

Step 4: Consider the nature of the acid. A diprotic acid can donate two protons (H⁺ ions) per molecule, but this information is not needed for calculating moles. It might be relevant for further calculations involving reactions or titrations.

Step 5: Review the calculation process. Ensure that you have correctly substituted the values and understand that the volume of water does not affect the calculation of moles in this scenario.