Question

Consider one mole of a mono atomic ideal gas. The gas undergoes adiabatic expansion an external pressure, as a result of which it cools from an initial temperature of 400 K to a final temperature of 300 K. Assume that the gas does no extra work other than the work of expansion. The magnitude of work done by the gas during the expansion in terms of ideal gas constant, R is equal to
A. 350 R
B. 250 R
C. 150 R
D. 100 R
( explanation please )​

Answer 1

Answer:

An adiabatic expansion has less work done and no heat flow, thereby a lower internal energy comparing to an isothermal expansion which has both heat flow and work done. Temperature decreases during adiabatic expansion. A dilute gas expands quasi-statically to three times its initial volume.