Question

the combustion of magnesium creates so much energy so quickly that it is hard to measure its enthalpy directly using a simple calorimeter. however, you will break this reaction down into other intermediate reactions whose enthalpies you can - and will - measure. what broad question are you answering by doing this experiment?

Explanation:

The experiment aims to find the enthalpy of magnesium combustion by using Hess's Law (breaking the reaction into measurable intermediate - reactions). So the broad question is related to determining the enthalpy of the combustion of magnesium.

Answer:

What is the enthalpy of the combustion of magnesium?