Posted by Jena on Monday, September 27, 2010 at 9:47pm.
I am in need of help about this specific heat question.
A 100.0g sample of aluminum released 1680 calories when cooled from 100.0 degrees C ti 20.0 degrees C. What is the specific heat of the metal?
I tried setting it up:
1680 cal
________________________
100.0 (100.0 *C 20.0 *C
i don't believe i set it up correctly.
thank you for your help!!

chemistry  bobpursley, Monday, September 27, 2010 at 10:01pm
YOu did set up correctly. Units you used are calories/gC

chemistry  DrBob222, Monday, September 27, 2010 at 10:02pm
That looks ok to me.
I would have done it this way.
q = maxx x sp.H. x (TfinalTinitial)
1680 = 100 * sp.H.*(20100)
which gives a negative numerator and a negative denominator BUT the numbers are the same and the  divided by a  is a +. I think 0.21 cal/g is the correct answer.
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