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Heat of Combustion Mass of water = 100g Temp rise of water = 15.0 C Mass of fuel used = 1.34g Molar mass of fuel = 56.4 g mol-1 Energy (Q) = mc T C = 4.18 J g-1K-1 Energy absorbed by water (Q) = 100g x 15K x 4.18Jg-1K-1 = 6270 J Moles fuel = 1.34g / 56.4 g mol-1 = 0.023 mol Molar heat of combustion = 6270 J / 0.023 mol = 272.6 kJ mol-1 Wrong Significant Figures X Heat of Combustion Mass of water = 100g Temp rise of water = 15.0 C Mass of fuel used = 1.34g Molar mass of fuel = 56.4 g mol-1 Energy (Q) = mc T C = 4.18 J g-1K-1 Energy absorbed by water (Q) = 100g x 15K x 4.18Jg-1K-1 = 6270 J Moles fuel = 1.34g / 56.4 g mol-1 = 0.023 mol Molar heat of combustion = 6270 J / 0.023 mol = 273 kJ mol-1

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