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Introduction of Thermo-chemistry

Thermo-chemistry is the study of the heat and energy related with physical transformations and/or chemical reactions. A reaction may be absorb or release energy and a phase change may do the similar task, like in boiling and melting. Thermo-chemistry focus on these energy changes, specifically on the energy of the system exchange with its surroundings. Thermo-chemistry is useful in the predicting reactant and product quantities all through the course of a given reaction. Combination with the entropy determinations, it is also be used to guess whether a reaction is non-spontaneous or spontaneous and favorable or unfavorable.

Exothermic reactions get released heat. Endothermic reactions absorbed the heat. Thermo-chemistry combines the notions of thermodynamics with the concept of energy in the type of chemical bonds. The subject usually includes calculations of such type of quantities like enthalpy, heat capacity, entropy, heat of formation, heat of combustion, free energy and calories.

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Certain laws apply when using thermo chemical equations:

ΔH is directly proportional to quantity of a substance that reacts or is get produced by a reaction.

Enthalpy is directly proportional to mass. That's why, if you double the coefficients in an equation, then the value of ΔH is also multiplied by two.

For Example:

H2 (g) + ½ O2 (g) → H2O (l); ΔH = -285.8 kJ

2 H2 (g) + O2 (g) → 2 H2O (l); ΔH = -571.6 kJ

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