Chemistry

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\ \text{J};

process is exothermic b)

q = +150\ \text{J};

process is endothermic c)

q = +150\ \text{J};

process is exothermic d)

q = +250\ \text{J};

process is endothermic

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