Question

Two mole of an ideal gas is expanded irreversibly and isothermally at 37⁰C until its volume is doubled and 3.41 kJ heat is absorbed from surrounding. $\Delta$Stotal (system + surrounding) is :

• A. –0.52 J/K
• B. 0.52 J/K
• C. 22.52 J/K
• D. 0

Answer 1

Answer: (B)

0.52 J/K

Answer 2

$\Delta$Ssystem = nR In $\frac{V_{2}}{V_{1}}$ = 2 × R × In 2 = 11.52 J/K

$\Delta$Ssurrounding = – $\frac{3.41 \times 1000}{310}$= – 11 J/K

$\Delta$Stotal = + 11.52 – 11 = + 0.52 J/K