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A 0.5g sample of C₁₀H₈ is burned in a calorimeter that contains 650 g of water at 20.0∘C. The heat capacity of the calorimeter is 420J∘C. If the final temperature of the water is 26.4∘C, what is the heat of combustion of the sample? Use cH₂O​=4.184J/g°C.