If I burn 0.315 moles of hexane (C6H14) in a calorimeter containing 5.65 liters of water, what’s the molar heat of combustion of hexane is the water

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If I burn 0.315 moles of hexane (C6H14) in a calorimeter containing 5.65 liters of water, what’s the molar heat of combustion of hexane is the water temperature rises 55.4 ºC? The heat capacity of water is 4.184 J/g ºC .