Question

Find the enthalpy of combustion of magnesium using Hess' law given the following data (assume that exactly 100.0 mL of HCl was used in each trial and that HCl is in excess)

Magnesium/HCl reaction:
Grams of Mg= 0.244g
Initial temp= 32.2 degrees celsius
Final temp= 21.3 degrees celsius

Magnesium Oxide/HCl reaction:
Grams of MgO= 0.996g
Initial temp= 28.8 degrees celsius
Final temp= 21.4 degrees celsius

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