Use the calorimeter data for the combustion of magnesium to determine the molar enthalpy of reaction (in kJ/mol)  for magnesium

Mass of Mg(s) 0.31 g

Initial temperature of calorimeter contents 23.6 ºC

Final temperature of calorimeter contents 36.8 ºC

Volume of calorimeter 100mL

 

I'm not sure what to do with the Volume. 

2 years ago

Answered By Michael Z

Calorimeters usually use water as a conductor of heat energy. So volume would be water. 100mg of water is 100g by mass for distilled water. Using Q=mct you get an energy value of Q=(100) x(4.19)x(13.2)=5530.8j=5.5308kj. Hm=H/n= 5.5308kj/(0.31g/24.31g/mol)=433.7kj/mol=4.3x10^2kj/mol

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