1. A vial containing an unknown sample is suspected to be one of the following compounds (mp.): urea (~133 °C), 2,4-dimethylacetanilide (~133 °C), phenacetin (~134°C) or 3-chlorobenzamide (~134 °C). A list of melting points taken on a machine when the 50% of the unknown by volume has been mixed with 50% each of the possibilities is shown in the following table: Melting point (°C) of mixture Substance mixed with unknown (50% each) urea 133.5-134.0 2,4-dimethylacetanilide phenacetin 3-chlorobenzamide 108.6-128.1 105.7-120.4 120.3-130.5 Identify the unknown and explain your reasoning, using the notes you have taken in the lab.

1. A vial containing an unknown sample is suspected to be one of the following compounds (mp.): urea (~133 °C), 2,4-dimethylacetanilide (~133 °C), phenacetin (~134°C) or 3-chlorobenzamide (~134 °C). A list of melting points taken on a machine when the 50% of the unknown by volume has been mixed with 50% each of the possibilities is shown in the following table: Melting point (°C) of mixture Substance mixed with unknown (50% each) urea 133.5-134.0 2,4-dimethylacetanilide phenacetin 3-chlorobenzamide 108.6-128.1 105.7-120.4 120.3-130.5 Identify the unknown and explain your reasoning, using the notes you have taken in the lab.

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

1. A vial containing an unknown sample is suspected to be one of the following compounds
(mp.): urea (~133 °C), 2,4-dimethylacetanilide (~133 °C), phenacetin (~134°C) or
3-chlorobenzamide (~134 °C). A list of melting points taken on a machine when the 50%
of the unknown by volume has been mixed with 50% each of the possibilities is shown in
the following table:
Melting point (°C)
of mixture
Substance mixed
with unknown (50% each)
urea
133.5-134.0
2,4-dimethylacetanilide
phenacetin
3-chlorobenzamide
108.6-128.1
105.7-120.4
120.3-130.5
Identify the unknown and explain your reasoning, using the notes you have taken in the lab.

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