Question

Calculate the value of change in internal energy in adiabatic expansion of ideal gas.​

Answer 1

Answer:

Explanation:

In an adiabatic process, ΔQ=0J

From 1st law of thermodynamics,

ΔQ=ΔU+ΔW

0=ΔU+ΔW

ΔU=−ΔW=−PΔV. . . . . . .(1)

At constant volume, V=constant

ΔV=0

From equation (1),  

ΔU=0J

Change in internal energy is temperature dependent. So, change in internal energy at constant volume  

ΔU=mC  

V

​

ΔT. . . . . .(2)

From equation (1) and (2), we conclude that internal energy in adiabatic process may diminish  at constant volume and may also increases.

The correct option is D.

Solve any question of Chemical Thermodynamics with:-

Answer 2

Answer:

According to the definition of an adiabatic process, ΔU=wad. Therefore, ΔU = -96.7 J. Calculate the final temperature, the work done, and the change in internal energy when 0.0400 moles of CO at 25.0oC undergoes a reversible adiabatic expansion from 200. L to 800,