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a "styrofoam cup" calorimeter percent error calculation

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xia_406:
hey guys, wondering if someone could help me with my lab.  

So recently we were asked to identify metals via specific heat capacities, and i decided to use a "styrofoam cup" calorimeter.  Everything seemed to work out great.  

the only problem is that now that ive done the calculatons, i found that i have a huuuuge percent error (>300%), and i was wondering what could be the cause of this? i dont think its reasonable to say this is all because of the crappyness of the styrofoam cup...any suggestions?

thanks

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