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

14. Solutions

Vapor Pressure Lowering (Raoult's Law)

General Chemistry

14. Solutions

Vapor Pressure Lowering (Raoult's Law)

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Multiple Choice

What is the vapor pressure of a 45.0% solution of glucose (C6H12O6) at a particular temperature, given that the vapor pressure of pure water at that temperature is 486 mm Hg?

268 mm Hg

267 mm Hg

267.5 mm Hg

267.3 mm Hg

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Verified step by step guidance

Identify the solute and solvent in the solution. Here, glucose (C6H12O6) is the solute, and water is the solvent.

Use the formula for the vapor pressure of a solution: P_solution = X_solvent * P_pure_solvent, where P_solution is the vapor pressure of the solution, X_solvent is the mole fraction of the solvent, and P_pure_solvent is the vapor pressure of the pure solvent.

Calculate the mole fraction of the solvent (water). First, determine the mass of glucose and water in the solution. Since the solution is 45.0% glucose by mass, it means 45.0 g of glucose and 55.0 g of water in 100 g of solution.

Convert the masses of glucose and water to moles. Use the molar mass of glucose (C6H12O6) which is approximately 180.18 g/mol, and the molar mass of water (H2O) which is approximately 18.02 g/mol.

Calculate the mole fraction of water (X_water) using the formula: X_water = moles of water / (moles of water + moles of glucose). Substitute this value into the vapor pressure formula to find the vapor pressure of the solution.