Describe how to use the information illustrated in the potential energy diagram below to determine the enthalpy change of the reaction and if the reaction is endothermic or exothermic.

Question

anonymous · Answer

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frostbite · Answer

Well as you know energy is conserved, so the potential energy is not lost, but simply converted into kinetic energy. Furthermore we know that the temperature is being proportional to the kinetic energy (at least so for a ideal gas with a proportional constant on $\large \frac{3}{2}k$)
We define a process that releases heat  as exothermic and one that absorbs heat is 
endothermic.

Based on this information, can you tell me the answer?

frostbite · Answer

How to determine the enthalpy change can evaluated from the diagram by the equation:
$$\Large \Delta H=H(C)-H(A)$$