객관식
If 24.0 grams of carbon monoxide (CO) undergoes complete oxidation to form carbon dioxide (CO2), how much heat is released, assuming the reaction is exothermic? The balanced equation is: 2CO(g) + O2(g) → 2CO2(g), ΔH = -566 kJ/mol.
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8. Thermochemistry
Thermochemical Equations
Multiple Choice
In a reaction energy diagram, which point or segment represents the enthalpy change (ΔH) of the reaction?
A
The horizontal axis where the reaction coordinate is zero
B
The peak of the curve representing the activated complex
C
The area under the curve between reactants and products
D
The vertical distance between the reactants and products
검증된 단계별 안내1
Understand that the enthalpy change (\$\(\Delta\) H\$) of a reaction is the difference in enthalpy between the products and the reactants.
In a reaction energy diagram, the vertical axis represents the potential energy or enthalpy, while the horizontal axis represents the reaction coordinate (progress of the reaction).
Identify the energy level of the reactants at the start of the reaction and the energy level of the products at the end of the reaction on the vertical axis.
The enthalpy change (\$\(\Delta\) H\$) is represented by the vertical distance between the energy level of the reactants and the energy level of the products.
Note that the peak of the curve represents the activated complex (transition state), and the area under the curve is not related to enthalpy change but could relate to other concepts like reaction rate or activation energy.
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