Chemistry: The Molecular Science (5th Edition)

by Moore, John W.; Stanitski, Conrad L.

Published by Cengage Learning

ISBN 10: 1285199049

ISBN 13: 978-1-28519-904-7

Chapter 9 - Liquids, Solids, and Materials - Questions for Review and Thought - Applying Concepts - Page 421e: 105c

Answer

The answer is below.

Work Step by Step

Based on the diagram, we see that the liquid phase does not exist below 43 atm. Thus, if red phosphorous is open to the atmosphere, it will sublime, not melt, when heated, for the pressure would be too low for the liquid form to exist.

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