During the isothermal expansion, a confined ideal gas does (-150) J of work against its surroundings. This means that (a) 150 J of heat has been added to the gas (b) 150 J of heat has been removed from the gas (c) 300 J of heat has been added to the gas (d) no heat is transferred because the process is isothermal

Answer: (b). Isothermal: Δ U = 0, so Q = W. W = -150 J ⇒ Q = -150 J. Negative Q means heat leaves the gas. So the answer is (b) 150 J of heat has been removed from the gas.

During the isothermal expansion, a confined ideal gas does (-150) J… | MHT CET 2025 (25 Apr, Shift 1)

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Thermodynamic Processes

During the isothermal expansion, a confined ideal gas does $(-150)\text{ J}$ of work against its surroundings. This means that

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Answer: (b)

Isothermal: $\Delta U = 0$ , so $Q = W$ .
$W = -150$ J $\Rightarrow Q = -150$ J.
Negative $Q$ means heat leaves the gas.
So the answer is (b) 150 J of heat has been removed from the gas.

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