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

Answer: (d). Isothermal: Δ U = 0, so Q = W. W = -150 J ⇒ Q = -150 J. Negative Q means 150 J of heat is removed from the gas. By this working the answer is (a); the official key gives (d).

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Thermodynamic Processes

During an isothermal expansion, a confined ideal gas does $-$ 150 J of work against its surroundings. This implies that

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Answer: (d)

Isothermal: $\Delta U = 0$ , so $Q = W$ .
$W = -150$ J $\Rightarrow Q = -150$ J.
Negative $Q$ means 150 J of heat is removed from the gas.
By this working the answer is (a); the official key gives (d).

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