Enthalpy is a thermodynamic quantity that describes the heat content of a system, that can not be measured directly. That's why we measure change in enthaply, measured in the units joules. The statement that e<span>nthalpy change depends on the rate at which a substance is heated or cooled is false. Enthalpy change depends only on the following factors: -</span><span>physical state of reactants and products - quantity of reactants</span><span> - allotropic modifications - temperature and pressure</span><span> </span>
