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How to Calculate Enthalpy Change.
Chemistry

How to Calculate Enthalpy Change.

Rosemary Njeri

Enthalpy change is the heat change accompanying a chemical reaction at constant volume or constant pressure.

Measuring the change in enthalpy allows us to determine whether a reaction was endothermic or exothermic.

Formula to calculate enthalpy change.

Calculate Enthalpy Change.
  • m is the mass of your reactants,
  • s is the the specific heat of your product.
  • ∆T is the temperature change from your reaction.

Example:

Suppose you have two reactants whose total mass is 30g, calculate the enthalpy change if the specific heat of their product is 4.2 joule/gram °C and the temperature change of the reaction is 40Kelvin.

Calculate Enthalpy Change.

Therefore, the enthalpy is 5,040 Joules.

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