Which of the following circumstances will result in a reaction that is spontaneous at all temperatures?
positive enthalpy change and positive entropy change
negative enthalpy change and negative entropy
change positive enthalpy change and negative entropy change
negative enthalpy change and positive entropy change

Answerit curves up and levels out.explanationwe assume that the container contains absolutely no ammonia to begin with as it states that "nitrogen gas and hydrogen gas" react to "produce ammonia."at dynamic equilibrium, the product and reactant concentrations are equal.this means that, starting from a concentration of zero, [nh₃] must curve "up" from zero and then level out to a constant concentration.