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Thermodynamics — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics1 Mark
Question
State why heat changes in physical and chemical processes are indicated by enthalpy changes and not by internal energy changes.
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Answer

Most of the processes are carried out in open container, at constant pressure. Therefore, enthalpy changes indicate heat changes in processes and not internal energy changes. Enthalpy changes are measured at constant pressure where as internal energy change is measured at constant volume.

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