Methanol(CH3OH) has a melting point of -96.7°C and a boiling point of 64.7°C. Its heat of fusion and vaporization are ΔHfus= 3.18 kJ/mol and ΔHvap=37.6kJ/mol, respectively, and the heat capacities of its three phases are Cs(solid) = 3.28J/g°C, Cs(liquid) = 2.53 J/g°C, and Cs(gas) = 3.62J/g°C. a. Sketch the heating curve for methanol. You should properly indicate the steepness of the heating portions, and the relative amount of heat required for the melting and boiling portions of the curve. b. Calculate the heat released when 25.0 grams of methanol vapor at 100 °C is converted to liquid methanol at 50°C. c. Liquid water has ΔHvap=40.7 kJ/mol. Which liquid requires more heat to completely convert to vapor?
Methanol(CH3OH) has a melting point of -96.7°C and a boiling point of 64.7°C. Its heat of fusion and vaporization are ΔHfus= 3.18 kJ/mol and ΔHvap=37.6kJ/mol, respectively, and the heat capacities of its three phases are Cs(solid) = 3.28J/g°C, Cs(liquid) = 2.53 J/g°C, and Cs(gas) = 3.62J/g°C. a. Sketch the heating curve for methanol. You should properly indicate the steepness of the heating portions, and the relative amount of heat required for the melting and boiling portions of the curve. b. Calculate the heat released when 25.0 grams of methanol vapor at 100 °C is converted to liquid methanol at 50°C. c. Liquid water has ΔHvap=40.7 kJ/mol. Which liquid requires more heat to completely convert to vapor?
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter5: Thermochemistry
Section: Chapter Questions
Problem 5.102QE
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Question
Methanol(CH3OH) has a melting point of -96.7°C and a boiling point of 64.7°C. Its heat of fusion and vaporization are ΔHfus= 3.18 kJ/mol and ΔHvap=37.6kJ/mol, respectively, and the heat capacities of its three phases are Cs(solid) = 3.28J/g°C, Cs(liquid) = 2.53 J/g°C, and Cs(gas) = 3.62J/g°C.
a. Sketch the heating curve for methanol. You should properly indicate the steepness of the heating portions, and the relative amount of heat required for the melting and boiling portions of the curve.
b.
Calculate the heat released when 25.0 grams of methanol vapor at 100
°C is converted to liquid methanol at 50°C.
c.
Liquid water has ΔHvap=40.7 kJ/mol. Which liquid requires more heat to completely convert to vapor?
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