redeye

what is the molar enthalpy of combustion for magnesium? calimetry experiment results 100.0ml of HCl with 0.31g of Mg ribbon temp before ribbon added 23degrees and after ribbon added 37degrees. Need to show work so I understand. q=mcdeltaT

so i use the specfic heat of water even thought its 100.0ml Of HCl solution that the Mg ribbon is going into. What is the units for the 100 if I do crossing off what do I end up with the deltaH should be in kj/mol