12 Chemistry

What is the molar enthalpy of combustion of magnesium? This was the lab question that I was asked to find after performing a lab based on Hess' law. I can't find anywhere in my notes how to calculate this, and the text book doesn't explain their steps properly, and I have different information than the book does. I was wondering how to go about doing this? I am wondering, is the enthalpy change the same thing? I know how to calculate the enthalpy change, where you break up the question into parts finding molar mass, and then using delta H= mct/n but I am not sure if this is the same thing.

Thanks.

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  1. If you can do enthalpy change for the experiment (the combustion), that will be for so many grams of Mg, then multiply by molar mass Mg to get molar enthalpy of combustion.

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