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Chem lab due in a few days I need desperate help

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so im currently doing an enthalpy change lab and im not getting anywhere near the theoretical value. the reaction is a single replacement exothermic reaction


The solution should be 1.0M at 25mL and the Zn added is 6g. 

The theoretical value of the enthalpy change is -217 kJ/mol but I currently have -19.68 kJ/mol. i'm so confused about how this is working???


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The actual reacted amount should be used to calculate enthalpy change, not what you added to the solution.

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