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Chemical Thermodynamics — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryChemical Thermodynamics2 Marks
Question
Define the term 'enthalpy',
What will happen to the internal energy if work is done by the system?
✓

Answer

Enthalpy: Enthalpy of a system may be defined as the sum of the internal energy of the system and the energy that arises due its pressure and volume.
First law of thermodynamics can be given as:
ΔU = q + W
If work is done by the system on the surroundings (work of expansion), then W is negative (-W). The negative value of ‘W’ signifies that energy has left the system as work. Therefore, internal energy of the system decreases.

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