value for δu is 20 kj when a system that is absorbing 30 kj of heat and is doing 10 kj work done.
Data given that work done by the system and heat is absorbed by the system.
Therefore,
q=30 kj
w=−10kJ
Now from first law of thermodynamics,
ΔU=q+w
=ΔU=30+(−10)=20kJ
=Uf−Ui=6⇒Uf=(Ui+20)
δu=20 kj
First Law of Thermodynamics: The change in total internal energy of a particular system between two states is described by the first law of thermodynamics. The first law of thermodynamics states that when heat is introduced to a system or when work is done, the total internal energy will change.
A positive result when calculating work done indicates that the system releases energy into the environment while performing work. If the value is negative, the environment's work on the system has contributed energy to it.
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