a. △H < 0 and △S > 0 b. △H > 0 and △ S < 0 c. △H = △S d. △H = 0 and △S = 0
I chose A, but now i'm not sure if it might be B, can you please explain the answer?
The whole purpose of a chemical reaction is to create products that are more stable. The most ideal reaction is one that has the reactants release energy to create products with lower energy. Releasing energy means the reaction is exothermic and so delta H is less than zero. Now following the second Law of Thermodynamics we know that the spontaneous nature of things is to be more chaotic. More chaos means an increase in entropy, which is delta S being greater than zero. All of this can be related to the equation delta G = delta H - T(delta S). When delta G is spontaneous it will be less than zero. When delta H is negative and delta S is positive then our reaction will always be spontaneous no matter the temperature. So good job! Answer choice A is correct.