Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
Find the molar mass given all this data

Transcribed Image Text:**Molar Mass by FPD: Data Sheet**
**Unknown Letter:** G
**Mass of Unknown Compound:** 0.60 g
**Mass of Naphthalene:** 4.330 g
---
**Table 1: Time and Temperature for Melting of Naphthalene and the Mixture**
| Time | Temp: Naphthalene Run | Temp: Mixture Run |
|-------|-----------------------|-------------------|
| 0:00 | 95.0°C | 95.0°C |
| 0:30 | 89.4°C | 86.8°C |
| 1:00 | 81.5°C | 79.7°C |
| 1:30 | 79.3°C | 74.4°C |
| 2:00 | 79.2°C | 71.1°C |
| 2:30 | 79.0°C | 68.9°C |
| 3:00 | 78.8°C | 67.6°C |
| 3:30 | 78.6°C | 66.5°C |
| 4:00 | 78.1°C | 66.3°C |
| 4:30 | 77.8°C | 65.3°C |
| 5:00 | 77.0°C | 64.0°C |
---
**Observations:**
- **Freezing Point of Naphthalene** (from graph 1): 80°C
- **Freezing Point of Mixture** (from graph 2): 66.5°C
- **Change in Freezing Point ΔT:** 80°C - 66.5°C = 13.5°C
**Note:** Attach both graphs to the lab report and follow the graphing guidelines in the instructions for clarity in data representation.
**Calculation for Molar Mass:**
Instructions indicate showing work clearly and in detail with units, ensure this is done in your report.
Expert Solution

Step 1
Given that,
Mass of naphthalene = 4.530 g = 4.530 10-3 kg
Mass of unknown = 0.60 g
Change in freezing point =
Kf = 6.90
Step by step
Solved in 2 steps

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