How is Hess's law used to calculate the enthalpy change of a reaction? A. The enthalpy of the products is subtracted from the enthalpy of
the reactants,
O B. The enthalpy is calculated from the experimentally determined
equilibrium constant.
C. The enthalpy changes of each step of the reaction are added
together
O D. The enthalpy is determined experimentally using a bomb
calorimeter.

what's the

where are the choice options?

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.