What Is Meant By Hess’s Law?
What Is Meant By Hess’s Law? Hess’s law, also called Hess’s law of constant heat summation or Hess’s law of heat summation, rule first enunciated by Germain Henri Hess, a Swiss-born Russian chemist, in 1840, stating that the heat absorbed or evolved (or the change in enthalpy) in any chemical reaction is a fixed quantity