Adding magnesium ribbon about 5g in a solvent of 100ml of, Ask an Expert

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Adding magnesium ribbon (about .5g) in a solvent of 100mL of HCl acid in a polysterne cup as my calorimeter. my question is why and how would my calculated anthalpy of reaction be inaccurate if:

1) some heat were transferred to the air or styrofoam cup

2) the surface of the magnessium ribbon had a coating of MgO.

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