Enthalpy and Enthalpy Change, Thermodynamics Chemistry Assignment Help

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Enthalpy and Enthalpy change

         The Heat content of system at constant pressure is termed as enthalpy denoted by 'H'.

         From the first law of thermodynamics, Δq=E+PV     ..........(i)

         Heat change at the constant pressure can be given as follows

                          1008_enthalpy change.png                                   ..........(ii)

         At the constant pressure heat can be replaced at the enthalpy.

                      2352_enthalpy change1.png                                                     .........(iii)

ΔH = Heat change or heat of reaction (in the chemical process) at constant pressure

         ΔE = Heat change or the heat of reaction at constant volume.

         In the case of solids and liquids participating in a reaction,

                   271_enthalpy change2.png

         Difference between the H and E is important when the gases are taking part in chemical reaction.

935_enthalpy change32.png

 

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