Multiple Choice
Calculate the amount of heat (in kilojoules) required to vaporize 2.58 kg of water at its boiling point, given that the enthalpy of vaporization for water is 40.7 kJ/mol.
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8. Thermochemistry
Endothermic & Exothermic Reactions
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Which of the following processes for ethanol (C2H5OH) is endothermic?
A
Condensation of ethanol at 78 °C
B
Melting of ethanol at -114 °C
C
Freezing of ethanol at -114 °C
D
Combustion of ethanol in oxygen
Verified step by step guidance1
Understand the concept of endothermic and exothermic processes. Endothermic processes absorb energy from the surroundings, while exothermic processes release energy.
Identify the nature of each process listed: Condensation, Melting, Freezing, and Combustion.
Condensation is the process where a gas turns into a liquid, which typically releases energy, making it exothermic.
Melting is the process where a solid turns into a liquid, which requires energy input to overcome the forces holding the solid together, making it endothermic.
Freezing is the process where a liquid turns into a solid, which releases energy, making it exothermic. Combustion is a chemical reaction that releases energy, making it exothermic.
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