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activation energy. The following list summarises the concepts covered in this chapter. The enthalpy change of the reaction is +49.0 kJ mol-1, and the entropy change of the system is -254 J K-1mol-1. The enthalpy change for the reaction is kJ mol-1, and the entropy change of the system is -216 J K-1mol-1. For example, carbon burns in oxygen to make carbon dioxide, but a piece of carbon will stay totally unchanged however long you keep it unless you first heat it. The energetics are right for a reaction to happen, but there is a huge activation energy. If the total entropy change is negative then the reaction isn’t feasible. A feasible reaction is one that is possible in terms of energy, but it doesn’t mean that it will necessarily happen. Although energetically it might be feasible, it may have a large Amazing the helm of awe viking all over print bedding setactivation energy barrier that will slow it down, or even prevent it from happening altogether at a particular temperature. For a reaction to be feasible, the total entropy has to increase – in other words the sign of the total entropy change must be positive. Notice that the negative sign in the equation converts the negative exothermic enthalpy change into a positive entropy change. An exothermic change heats the surroundings, and increases the entropy of the surroundings. There is a mismatch between the units of enthalpy change and entropy change. When you quote figures

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