During a single-step expansion against a constant external pressure

CHEMISTRY · Single correct · AP · Chemistry · Thermochemistry · Thermochemistry

Problem

During a single-step expansion against a constant external pressure, a gas performs 200 J of work on the surroundings. After the expansion, its internal energy is found to have decreased by 50 J. Which of the following gives the magnitude and sign of q (heat) for the process and correctly classifies it as endothermic or exothermic? (a) q=−250 J;q = −250\ \text{J}; process is exothermic (b) q=+150 J;q = +150\ \text{J}; process is endothermic (c) q=+150 J;q = +150\ \text{J}; process is exothermic (d) q=+250 J;q = +250\ \text{J}; process is endothermic

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