Introductory Chemistry: Concepts and Critical Thinking (8th Edition)
8th Edition
ISBN: 9780134421377
Author: Charles H Corwin
Publisher: PEARSON
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Question
Chapter 11, Problem 60E
Interpretation Introduction
Interpretation:
The prediction of values of Mp, Bp,
Concept introduction:
The melting point of a compound is the temperature at which solid converts into liquid form. The boiling point is the temperature at which the vapor pressure of the liquid becomes equal to the atmospheric pressure. The heat of fusion of a compound is the amount of energy required to convert solid into liquid form. The heat of vaporization is the amount of heat required to convert the liquid state to the gaseous state.
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42. Using the data below, calculate the heat of vaporization (AHvap) for hydrazine. (1 atm =
760 mm Hg)
Normal freezing point
Normal boiling point
2 °C
113.5 °C
380 °C
145.4 atm
14.4 mm Hg
Critical temperature
Critical pressure
Vapor pressure at 25.0 °C
A) 43.0 kJ/mol
B) 1.06 kJ/mol
C) 12.0 kJ/mol
D) 70.4 kJ/mol
E) Cannot be determined - more information is needed.
At 1.0 atm pressure, ice (solid H2O) floats in water instead of sinking. The reason for this is
the critical temperature has a higher temperature than the normal boiling point.
the triple point corresponds to a pressure below 1 standard atmosphere.
C) the fusion process is endothermic, therefore the solid will float.
D) when water freezes, it expands instead of contracting.
the triple point has a lower temperature than the freezing point for water.,
The normal boiling point temperatures of the Noble gases are tabulated below.
Noble gas He Ne Ar Kr Xe Rn
Boiling Point (K) 4.32 27.23 87.34 121.4 166.6 211.2
Explain the trend in these temperatures in terms of molar mass the cohesive force.
Chapter 11 Solutions
Introductory Chemistry: Concepts and Critical Thinking (8th Edition)
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