Chemistry XII Content
First Law of Thermodynamics
Let the initial volume of the system is V1 and initial internal energy is U1. Let DQP the gas is heated from |
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T1 K to T2 K. Addition of heat causes the following changes in the system: | |
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According to the first law of
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thermodynamics: |
DQ = DU+ DW
But DW = PDV Thus DQP = DU+ PDV As DV = (V2 – V1) DQP = DU+ P (V2 – V1) |
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GRAPHICAL REPRESENTATION
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Graph between P & V for an isobaric process is a straight line which is parallel to V-axis. | |