Concept:An endothermic reaction fundamentally involves the absorption of thermal energy from the surroundings, converting it into internal chemical potential energy (heat content or enthalpy, \( H \)).
Formula:$$ \Delta H = H_{\text{products}} - H_{\text{reactants}} > 0 $$
Solution:- Because energy is absorbed during the reaction, this energy is stored in the chemical bonds of the newly formed products.
- Consequently, the total internal enthalpy (heat content) of the system increases.
- This means the final state (Products) possesses a higher heat content than the initial state (Reactants).
- Therefore, the heat content of the Products is more than that of reactants.
Why other options are incorrect:If they were equal, \( \Delta H = 0 \). If reactants had more, energy would be released (an exothermic reaction).
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