You decide to pan for gold. You find a shimmery piece of gold colored material i

Question

You decide to pan for gold. You find a shimmery piece of gold colored material in your pan. You know the area is also known for having "fool's gold" or pyrite. Pyrite is the mineral FeS_2 You decide the best way to determine if you have gold or pyrite is to perform a calorimetry experiment. You look up the specific heat of gold (0.129 J/g degree C) and of pyrite (0.520 J/g degree C). You then collect the following data What metal do you have? Justify your answer by showing you, work and calculating the heat of the metal.

Explanation / Answer

Heat given by sample = heat absorbed by water

heat given by sample = mass x specific heat x drop in temperature

= 5.3g x s x(22.80-98.20)K

= -399.62 s g.K

heat absorbed by water = 100 g x 4.184 J/g.K x (22.8-22.3)

= 209.2 J

Equating both 399.62s g.K= 209.2 J

and specific heat of sample = 0.5235 J/g.k

Thus the metal in the sample is Fe not gold.

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