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Thermochemistry problem

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A 0.1203 g sample of solid magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 1769 J/?C. The calorimeter contains exactly 261 g of water, and the temperature increases by 1.126 degrees C. Calculate the heat given off by the burning Mg, in kJ/g and in kJ/mol.

I have tried -16.6 KJ/g and -386 KJ/mol- What am I missing?

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