Question
Choose the correct statement for the work done in the expansion and heat absorbed or released when 5 litres of an ideal gas at 10 atmospheric pressure isothermally expands into vacuum until volume is 15 litres:
NEET
Chemistry
Thermodynamics (C)
2024
NEET 2024 (Re-NEET)
NEET Chemistry Question (2024) — Solution
Options
- A. Both the heat and work done will be greater than zero
- B. Heat absorbed will be|less than zero and work done will be positive
- C. Work done will be zero and heat will also be zero
- D. Work done will be greater than zero and heat will remain zero
Answer
C. Work done will be zero and heat will also be zero
Step-by-step solution
Since it is isothermal, T =0 U = nC C _ v T =0 Since expansion is taking place against vacuum P_ ext =0 W=-P ex V=0 From first law of thermodynamics, U=q+W 0=q+0 q=0
Related: Chemistry — Thermodynamics (C) · All PYQ Banks