If the enthalpy change of a reaction in a flask is δh = +67 kj, what can be said about the reaction?

Answer : Normally in any chemical reaction, if the enthalpy change i.e. ΔH is positive which means it is greater than zero then it can be called as an Endothermic Reaction.

Whereas, the system under study is absorbing heat that is produced during the reaction. So if  ΔH  is found to be positive then it can be called as endothermic reaction.

The teacher is mostly talking about the distillation of a mixture