A 50.5 gram sample of solid water is convert to liquid water by heating from -15.0 °C to 47.0 °C. During heating, it undergoes a phase change from solid to liquid at 0°C. Calculate the total energy in kilojoules (kJ) absorbed by water during this heating process. [hint 1-The AHfus of water at 0°C is 334 J/g, the specific heat of solid water is 2.108 J/g°C and thee specific heat of liquid water is 4.184 J/g°C] [hint 2- equations to calculate energy (q): at a phase change: q = m.AH; during temperature change within a phase: q = m.sh.AT]
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.
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![A 50.5 gram sample of solid water is convert to liquid water by heating from -15.0 °C to
47.0 °C. During heating, it undergoes a phase change from solid to liquid at 0°C.
Calculate the total energy in kilojoules (kJ) absorbed by water during this heating
process.
[hint 1-The AHfus of water at 0°C is 334 J/g, the specific heat of solid water is 2.108
J/g°C and thee specific heat of liquid water is 4.184 J/g°C]
[hint 2- equations to calculate energy (q): at a phase change: q = m-AH; during
temperature change within a phase: q = m-sh-AT]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd0096572-fde0-4644-aa4e-058f46ddb927%2F67a119e4-2f4c-41da-b2bd-2308619b21c6%2F7e118xc_processed.jpeg&w=3840&q=75)
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