[propyne]

I did a lab were I had to find the calorimeter constant and then had a reaction happen in the calorimeter. The calorimeter had HCl and I dropped a piece of magnesium.
I was able to find the calorimeter constant. I don't know how to do two things.
I need to find the heat that the reaction gave off then I was asked to go find the heat of formation for the Mg2+ ion to find the mass of the piece of Mg that I dropped. I can't find it. I saw MgO and MgCl2 and I was thinking I could somehow solve for it... but how?

[propyne]

I was able to find the heat formation of Mg2+ -462.0 kJ/mol at 25 °C for 1 M. I can't find the heat of the reaction Mg + HCl. This is what i've thought of so far
qloss= (maDTSg) + (DT Scal)
(heat lost by reaction = heat gained by remaining HCl + Heat absobed by calorimeter. )
Is that close to being right?

[Borek]

Please supply more details about what you did in the experimental part.