This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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In thermodynamics, the sign of the heat quantity (q or H) indicates the direction of heat flow relative to the system (the reaction). Exothermic reactions: The sign of the heat quantity is negative (q < 0 or H < 0). Why: Exothermic reactions release* heat energy to the surroundings. This means the system (the reacting chemicals) loses energy. By convention, when a system loses energy in the form of heat, the heat quantity is assigned a negative sign. Endothermic reactions: The sign of the heat quantity is positive (q > 0 or H > 0). Why: Endothermic reactions absorb* heat energy from the surroundings. This means the system (the reacting chemicals) gains energy. By convention, when a system gains energy in the form of heat, the heat quantity is assigned a positive sign. 3 done, 2 left today. You're making progress.