Multiple Choice
Which of the following is the thermodynamic product formed during the reaction of 1,3-butadiene with HBr under conditions of high temperature and long reaction time?
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8. Thermochemistry
Thermochemical Equations
Multiple Choice
Which thermodynamic property is commonly listed in tables of pure substances and represents the amount of heat required to raise the temperature of one mole of a substance by one degree Celsius at constant pressure?
A
Gibbs free energy (G)
B
Standard enthalpy of formation (ΔH_f^ext{°})
C
Standard entropy (S^ext{°})
D
Molar heat capacity at constant pressure (C_p)
Verified step by step guidance1
Understand that the problem asks for a thermodynamic property that quantifies the heat required to raise the temperature of one mole of a substance by one degree Celsius at constant pressure.
Recall that the heat required to change the temperature of a substance depends on its heat capacity, which can be measured at constant volume (C_v) or constant pressure (C_p).
Identify that the property specifically related to heating at constant pressure is the molar heat capacity at constant pressure, denoted as \(C_p\), which is defined as \(C_p = \left(\frac{\partial H}{\partial T}\right)_p\), where \(H\) is enthalpy and \(T\) is temperature.
Note that other options like Gibbs free energy (\(G\)), standard enthalpy of formation (\(\Delta H_f^{\circ}\)), and standard entropy (\(S^{\circ}\)) describe different thermodynamic quantities and do not directly represent heat capacity.
Conclude that the molar heat capacity at constant pressure (\(C_p\)) is the correct thermodynamic property commonly listed in tables for pure substances to describe the heat required to raise the temperature by one degree Celsius at constant pressure.
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