Question

A sample of acetone having a mass of 1.920 g undergoes complete combustion in an insulated calorimeter holding 400 mL of water. It is determined that the water and calorimeter together absorb 58.829 kJ of heat energy from this combustion. Based on this information, what is the standard molar enthalpy of combustion for acetone in kJ/mol?

I have tried it and got as far to the mole part. the answer is -1780 kJ/mol but I'm getting like 8.5 kJ/mol when I divide using molar enthalpy change equation, help!
molar mass of acetone ... 58.08 g

moles of acetone ... 1.920 / 58.08

molar enthalpy is energy per mole

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