How to find entropy change if enthalpy change is given?
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If you only calculate the entropy change of the reaction (the entropy change of the system), you are leaving out an important factor.
Suppose your reaction is exothermic. Heat is given off to the surroundings, and that extra heat increases the entropy of the surroundings.
If you add more energy to the surroundings, the number of different possibilities for arranging the energy over the molecules increases. And so increasing the temperature increases the entropy of the surroundings.
The reverse is true for an endothermic change. An endothermic reaction will cool the surroundings, and so the entropy of the surroundings decreases.
What matters is the total entropy change, which is the sum of the entropy changes of the system and the surroundings.
hope it helps u
Suppose your reaction is exothermic. Heat is given off to the surroundings, and that extra heat increases the entropy of the surroundings.
If you add more energy to the surroundings, the number of different possibilities for arranging the energy over the molecules increases. And so increasing the temperature increases the entropy of the surroundings.
The reverse is true for an endothermic change. An endothermic reaction will cool the surroundings, and so the entropy of the surroundings decreases.
What matters is the total entropy change, which is the sum of the entropy changes of the system and the surroundings.
hope it helps u
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