Question

Two litres of an ideal gas at a pressure of 10 atm expands isothermally at `25^(@)C` into a vacuum until its total volume is 10 litres. How much heat is absorbed and how much work is done in the expansion ?
A. 0,0
B. 0,2
C. 3,0
D. 1.5,1.5

Answer 1

Correct Answer - A
Given, pressure=10 atm, final volume =10L and initial volume=2L.
For isothermal process, `DeltaU=0`
From irst law of thermodynamics
`implies0=q+W` or `q=-W=p_(ext)(10-2)=0xx8=0`
Thus, no work is done, and hence, no heat is absorbed.