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Enthalpy Calculator Online

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The Enthalpy Calculator serves as a vital tool in thermodynamics, specifically used to determine the total enthalpy change occurring during a chemical reaction. Enthalpy, denoted by ΔH, represents the heat content of a system at constant pressure. Calculating ΔH aids in understanding the heat exchange, energy flow, and the reaction’s overall thermodynamic feasibility.

Formula of Enthalpy Calculator

The formula for calculating ΔH is represented as:

ΔH = ΣniΔHi


  • ΔH signifies the total enthalpy change for the reaction.
  • Σ signifies the summation sign, implying the aggregation of enthalpy changes for all reactants and products.
  • ni corresponds to the stoichiometric coefficient of each substance, being either a reactant or a product, present in the balanced chemical equation.
  • ΔHi signifies the standard enthalpy change for each substance, generally expressed in units of kilojoules per mole (kJ/mol). It represents the change in enthalpy as the substance transitions from its standard state to the state specified in the reaction.
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General Terms Table

Enthalpy ChangeThe amount of heat absorbed or released during a chemical reaction.
ThermodynamicsThe branch of physical science that deals with the relations between heat and other forms of energy.
Standard StateThe most stable form of a substance at a defined temperature and pressure.
Stoichiometric CoefficientThe numeric value that represents the ratio of moles of each reactant or product in a chemical equation.

Example of Enthalpy Calculator

Consider the combustion of methane (CH₄). The balanced chemical equation is:

CH₄ (g) + 2O₂ (g) -> CO₂ (g) + 2H₂O (l)

To determine the ΔH for this reaction, the enthalpies of formation for each substance involved must be known. Subsequently, using the formula, the ΔH can be calculated by applying stoichiometric coefficients.

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Most Common FAQs

Q: How is Enthalpy different from Energy?

Enthalpy involves the internal energy of a system combined with the pressure-volume product, whereas energy is a broader term encompassing various forms like kinetic, potential, and thermal.

Q: What is the significance of ΔH in chemical reactions?

ΔH signifies whether a reaction is endothermic (absorbing heat) or exothermic (releasing heat), aiding in predicting a reaction’s directionality.

Q: Can the Enthalpy Calculator be used for all reactions?

Yes, the calculator is applicable to various reactions, provided enthalpy values for substances involved are known.

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