Question

An ideal monotonic gas containing five moles at $27^\circ\text{C}$ and one atm pressure is expanded adiabatically to thrice of its volume. The change in internal energy is:

• A. \(+9007 \text{ J} \)
• B. \(-9007 \text{ J} \)
• C. \(+9711 \text{ J} \)
• D. \(-9711 \text{ J} \)

Hint:

Adiabatic expansion always leads to cooling of the gas ($T_2 < T_1$), meaning the change in internal energy $\Delta U$ must be negative.

Answer 1

The Correct Option is B