Chemical Thermodynamics Question 315

Question: An ideal gas expands from an initial volume Pinto vacuum under isothermal conditions. For this process,

Options:

A) $ \Delta U\ne 0,,W=0,and,Q\ne 0 $

B) $ \Delta U\ne 0,,W\ne 0,and,Q\ne 0 $

C) $ \Delta U\ne 0,,W\ne 0,and,Q=0 $

D) $ \Delta U=0,,W=0,and,Q=0 $

Show Answer

Answer:

Correct Answer: D

Solution:

  • For an isothermal expansion of an ideal gas $ \Delta U=0 $ Since $ P_{ext} $ is zero in vacuum. $ W=-P_{ext}\Delta V=0 $

$ \therefore Q=0 $



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