During an isothermal expansion, a confined ideal gas does –275 J of work against its surrounding. This implies that :
Answer & explanation
Correct answer: option 3
By first law of thermodynamics, ΔU = Q + W
For isothermal process, ΔU = 0
Thus, Q = – W ; W = – 275 Q = + 275
Thus, 275 J of heat is added to the gas.