What about the canadian labor force shows that the country is in the postindustrial stage

I would imagine percent of labor force employed in service industry, but you have to check numbers.

Quizlet has the answer

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen