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When 34.1 g of lead reacts with 6.81 L of oxygen gas, measured at 1.00 atm and 25.0°C, 36.1 kJ of heat is released at constant pressure. What is DH° for this reaction?

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What reaction? The most plausible answer for a question that leaves me with questions is dH rxn = -36.1 kJ since it is exothermic.

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