Thermodynamics And Thermochemistry
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Thermodynamics and Thermochemistry - Result Question 21
21. $\Delta U$ is equal to
(2017 Main)
(a) isochoric work
(b) isobaric work
(c) adiabatic work
(d) isothermal work
Show Answer
Answer:
Correct Answer: 21. (c)
Solution:
According to first law of thermodynamics,
$ \Delta U=q+W=q-p \Delta V $
In isochoric process $(\Delta V=0), \Delta U=q$
In isobaric process $(\Delta p=0), \Delta U=q$
In adiabatic process $(q=0), \Delta U=W$
In isothermal process $(\Delta T=0)$ and $\Delta U=0$
$\therefore \Delta U$ is equal to adiabatic work.
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