Hess' Law states that 'the enthalpy change during a chemical reaction depends only on the initial and final states of the chemical system and not on the path followed in getting from reactants to products.
Therefore the total enthalpy change in a system must be zero!
enthalpy change = energy absorbed to break bonds - energy released in making bonds
The stronger the atraction between the atoms, the higher the bond dissociation energy and the shorter the bond length. Therefore bonds that require a larger energy to break will create a slower reaction at room temperature because more energy has to be taken from the surroundings to break the reactant bonds.
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