Final answer:
The relationship between two compounds can be determined by using stoichiometry, thermochemical calculations involving ΔGf and K, Hess's law for enthalpy, and kinetic equations for reaction rates.
Step-by-step explanation:
The relationship between two compounds in a chemical reaction can be determined through various methods. Stoichiometry, for example, involves using a balanced chemical equation to find the stoichiometric factor relating the substances of interest, showing how much of one substance is needed to react with another. In thermodynamics, the relationship between the free energy change (ΔGf) and the equilibrium constant (K) can be established, where K can help describe the extent and direction of the chemical reaction. Additionally, Hess's law illustrates how the enthalpies of individual steps in a reaction can be added to determine the overall enthalpy of formation, as shown for cesium fluoride (CsF) in Table 7.4. Kinetic analysis involves writing equations to relate the rates of consumption of reactants to the rates of formation of products. Finally, comparing the activation energies of two reactions can indicate which reaction may proceed faster.