What equation do I use to calculate enthalpy?
Flexi Says: An enthalpy change that occurs specifically under standard conditions is called the standard enthalpy (or heat) of reaction and is given the symbol ΔH∘. The standard heat of reaction can be calculated by using the following equation.
ΔH∘ = ∑nΔH∘f (products) − ∑nΔH∘f (reactants)
The symbol Σ is the Greek letter sigma and means “the sum of”. The standard heat of reaction is equal to the sum of all the standard heats of formation of the products minus the sum of all the standard heats of formation of the reactants. The symbol “n” signifies that each heat of formation must first be multiplied by its coefficient in the balanced equation.