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

Boiling Point Elevation

General Chemistry

14. Solutions

Boiling Point Elevation

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Multiple Choice

What mass in grams of NaCl would need to be added to 2951 g of water to increase the boiling temperature of the solution by 1.500°C? (Kb for water is 0.5100°C/m)

135.0 g

67.5 g

270.0 g

45.0 g

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Verified step by step guidance

Identify the formula for boiling point elevation: ΔT_b = i * K_b * m, where ΔT_b is the change in boiling point, i is the van't Hoff factor, K_b is the ebullioscopic constant, and m is the molality of the solution.

Determine the van't Hoff factor (i) for NaCl. Since NaCl dissociates into two ions (Na^+ and Cl^-), i = 2.

Rearrange the formula to solve for molality (m): m = ΔT_b / (i * K_b). Substitute the given values: ΔT_b = 1.500°C, i = 2, and K_b = 0.5100°C/m.

Calculate the molality (m) using the rearranged formula. This will give you the moles of solute per kilogram of solvent.

Convert the molality to mass of NaCl. Use the molality to find the moles of NaCl needed, then multiply by the molar mass of NaCl (58.44 g/mol) to find the mass in grams. Remember to convert the mass of water from grams to kilograms when using the molality formula.