How much heat (in kJ) is required to convert 423 g of liquid H2O at 24.8°C into steam at 147°C? (Assume that the specific heat of liquid water is 4.184 J/g·°C, the specific heat of steam is 2.078 J/g·°C, and that both values are constant over the given temperature ranges. The normal boiling point of H2O is 100.0°C.) kJ
How much heat (in kJ) is required to convert 423 g of liquid H2O at 24.8°C into steam at 147°C? (Assume that the specific heat of liquid water is 4.184 J/g·°C, the specific heat of steam is 2.078 J/g·°C, and that both values are constant over the given temperature ranges. The normal boiling point of H2O is 100.0°C.) kJ
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter9: Energy And Chemistry
Section: Chapter Questions
Problem 9.106PAE
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4. Carbon tetrachloride, CCl4, was once used as a dry cleaning solvent, but is no longer used because it is carcinogenic. At 59.2°C, the vapor pressure of CCl4 is 58.9 kPa, and its enthalpy of vaporization is 29.82 kJ/mol. Use this information to estimate the normal boiling point (in °C) for CCl4.
°C
5. How much heat (in kJ) is required to convert 423 g of liquid H2O at 24.8°C into steam at 147°C? (Assume that the specific heat of liquid water is 4.184 J/g·°C, the specific heat of steam is 2.078 J/g·°C, and that both values are constant over the given temperature ranges. The normal boiling point of H2O is 100.0°C.)
kJ
6.
From the phase diagram for water (figure below), determine the state of water at the following.
(a)
34°C and 83 kPa
solidliquid gas
(b)
0.01°C and 0.2 kPa
solidliquid gas
(c)
−10°C and 24 kPa
solidliquid gas
(d)
195°C and 96 kPa
solidliquid gas
(e)
42°C and 117 kPa
solidliquid gas
(f)
85°C and 10 kPa
solidliquid gas
6. dentify the type of crystalline solid (metallic, covalent network, ionic, or molecular) formed by each of the following substances.
(a)
Au
metalliccovalent network ionicmolecular
(b)
B
metalliccovalent network ionicmolecular
(c)
NH4Cl
metalliccovalent network ionicmolecular
(d)
S8
metalliccovalent network ionicmolecular
(e)
CCl4
metalliccovalent network ionicmolecular
(f) Na3PO4
metalliccovalent network ionicmolecular
(g)
C6H6
metalliccovalent network ionicmolecular
(h)
MgSO4
metalliccovalent network ionicmolecular
(i)
C (diamond)
metalliccovalent network ionicmolecular
8. Classify each substance in the table as either a metallic, covalent network, ionic, or molecular solid.
Substance | Appearance | Melting Point | Electrical Conductivity | Solubility in Water |
---|---|---|---|---|
X | shiny, malleable | 1907°C | high | insoluble |
Y | brittle, white | 734°C | only if melted/dissolved | soluble |
Z | hard (not brittle), colorless | 1722°C | none | insoluble |
Substance X
metalliccovalent network ionicmolecular
Substance Y
metalliccovalent network ionicmolecular
Substance Z
metalliccovalent network ionicmolecular
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