Consider the following data for H2O: Melting Point = 0.0°C Boiling Point = 100.0°C ΔHfusion = 6.01 kJ/mol ΔHvaporization = 40.8 kJ/mol Specific Heat of Ice = 2.03 J/g•°C Specific Heat of Water = 4.18 J/g•°C Specific Heat of Water Vapor = 1.99 J/g•°C Sketch a heating curve that depicts ice at -25.0°C being heated until the temperature reaches 125.0°C and then calculate the total amount of heat in kilojoules absorbed when 175 grams of H2O undergoes this process.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Consider the following data for H2O:
Melting Point = 0.0°C
Boiling Point = 100.0°C
ΔHfusion = 6.01 kJ/mol
ΔHvaporization = 40.8 kJ/mol
Specific Heat of Ice = 2.03 J/g•°C
Specific Heat of Water = 4.18 J/g•°C
Specific Heat of Water Vapor = 1.99 J/g•°C
Sketch a heating curve that depicts ice at -25.0°C being heated until the temperature reaches 125.0°C and then calculate the total amount of heat in kilojoules absorbed when 175 grams of H2O undergoes this process.
Given:
Melting Point = 0.0°C
Boiling Point = 100.0°C
ΔHfusion = 6.01 kJ/mol
ΔHvaporization = 40.8 kJ/mol
Specific Heat of Ice = 2.03 J/g•°C
Specific Heat of Water = 4.18 J/g•°C
Specific Heat of Water Vapor = 1.99 J/g•°C
mass of water = 175 g
initial temperature of ice = -25 °C
Final temperature of water vapor = 125 °C
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