Click on the delta H Changes sign when a process is reversed button within the a

Question

Click on the delta H Changes sign when a process is reversed button within the activity and analyze the relationship between the two reactions that are displayed. The reaction that was on the screen when you started and its derivative demonstrate that the reaction enthalpy, delta H, changes sign when a process is reversed. Consider the reaction H_2O(l) rightarrow H_2O(g), delta H = 44.0 KJ mol^-1 What will delta H be for the reaction if it is reversed? Express your answer with appropriate units.

Explanation / Answer

Enthalpy is a state function that is one process that depends on only the initial and final state of the process. That means the energy required to push a reaction to its products will be directly reversed when the reaction is reversed.

For the given reaction is vaporization of water

H2O (l) gives H2O (g)               D H = 44 kJ/mole

H2O (g) gives H2O (l)               D H = -44 kJ/mole

Since enthalpy is a state function.

For the condensation of steam

D H = -44 kJ/mole

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