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

6. Chemical Quantities & Aqueous Reactions

Solutions

General Chemistry

6. Chemical Quantities & Aqueous Reactions

Solutions

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Multiple Choice

What is the mass percent of KCl in the solution prepared by dissolving 165.0 g of KCl in 275 g of water?

60.0%

37.5%

45.0%

25.0%

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Verified step by step guidance

Understand the concept of mass percent: Mass percent is a way of expressing the concentration of a component in a mixture. It is calculated as the mass of the solute divided by the total mass of the solution, multiplied by 100 to get a percentage.

Identify the solute and solvent: In this problem, KCl is the solute, and water is the solvent. You are given the mass of KCl as 165.0 g and the mass of water as 275 g.

Calculate the total mass of the solution: Add the mass of the solute (KCl) to the mass of the solvent (water) to find the total mass of the solution. Use the formula:

m_total = m_KCl + m_water

Calculate the mass percent of KCl: Use the formula for mass percent:

mass_percent = \frac{m_KCl}{m_total} \times 100

Substitute the values into the formula: Plug in the mass of KCl and the total mass of the solution into the mass percent formula to find the mass percent of KCl in the solution.