Question

An ideal gas expands from an intial volume `V` into vacuume under isothermal conditions. For this process,
A. `DeltaUne 0,W=0` and `Qne 0`
B. `DeltaU ne 0,Wne 0` and `Q ne O`
C. `DeltaUne 0,Wne 0` and `Q= 0`
D. `DeltaU=0,W=0` and `Q=0`

Answer 1

Correct Answer - C
For an isothermal expansion of an ideal gas `DeltaU=0`
Since `P_(ext)` is zero in vacuum.
`W=-P_(ext)DeltaV=0`
`:. Q=0`