Endothermic and EQM

Which process is endothermic? Ans is H2O(g) -> 2H(g) + O(g)... but I thought it was H2O(g) -> H2O(l) because there is a change of state resulting to larger distance between the particles.

Also, is the following always true for eqm: Conc. of prodx and rxtants do not change

Another thing is the following eqm rxn: Ethanoic acid + Ethanol <-> Ethyl ethanoate and water

So is Kc = [Ethyl ethanoate][Water] / [Ethanoic acid][Ethanol]? Why is water featured in the eqm constant - I thought there is no change in its conc. b/c it is water

Thanks! I appreciate any help.

Reply 1

EierVonSatan

Breaking bonds is endothermic

Concentration of products/reactants (i.e. Kc) changes with temperature

[Water] can only be taken as constant when it is in large excess (i.e. so that it's value doesn't change e.g. when it's a solvent)