A gas is compressed when the surroundings perform 125 J of work on it

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

Problem

A gas is compressed when the surroundings perform 125 J of work on it, and during the compression the gas releases 250 J of heat to the surroundings. What is the change in internal energy, ΔU, of the gas, and is the overall process endothermic or exothermic? (a) ΔU=−375  J;\Delta U = -375\;\text{J}; process is exothermic (b) ΔU=+250  J;\Delta U = +250\;\text{J}; process is endothermic (c) ΔU=−125  J;\Delta U = -125\;\text{J}; process is exothermic (d) ΔU=−125  J;\Delta U = -125\;\text{J}; process is endothermic

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