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 ??? or ??? 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.
