The mass of C 2 H 6 is easily converted to the amount of C 2 H 6 from which the heat energy q is easily calculated by means of Eq. (2). It is important to realize that the value of ΔH m given in therm...The mass of C 2 H 6 is easily converted to the amount of C 2 H 6 from which the heat energy q is easily calculated by means of Eq. (2). It is important to realize that the value of ΔH m given in thermochemical equations like \(\ref{1}\) or \(\ref{3}\) depends on the physical state of both the reactants and the products. The only way the problem can he avoided is for ΔH m of the reverse reaction to be equal in magnitude but opposite in sign from ΔH m of the forward reaction.
