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Question
Chemistry
Posted 3 months ago
Define enthalpy change in a chemical reaction.
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Answer from Sia
Posted 3 months ago
Solution
1
Define enthalpy change: Enthalpy change in a chemical reaction refers to the heat absorbed or released under constant pressure. It is denoted by ΔH\Delta H
2
Mathematical expression: The enthalpy change for a reaction can be expressed as ΔH=HproductsHreactants\Delta H = H_{\text{products}} - H_{\text{reactants}}, where HproductsH_{\text{products}} is the enthalpy of the products and HreactantsH_{\text{reactants}} is the enthalpy of the reactants
Answer
The enthalpy change in a chemical reaction is the heat absorbed or released at constant pressure, calculated as the difference in enthalpy between the products and the reactants.
Key Concept
Enthalpy Change (ΔH\Delta H)
Explanation
Enthalpy change is the difference in heat content between reactants and products at constant pressure. It is a central concept in thermochemistry and is used to determine whether a reaction is endothermic or exothermic.

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