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104422816 wrote:But how do you know what the sign of the forward reaction was to begin with? is that dependent on whether the reaction is endothermic or exothermic?
Yes, an enthalpy value for a reaction depends on whether it's endo- or exo- thermic. For example, consider the reaction of methane with water vapor.
CH4(g) + H2O(g) --> CO2(g) + 3H2(g)
delta H = -318 kJ
The delta H value signifies that this reaction is exothermic. Reversed, it would be endothermic and the delta H value would be positive.
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