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Old May 1st 2016, 08:34 AM   #1
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Confused, Please Help

Hi, I am stuck on a particular exercise. The problem is as follows:

A 550g piece of metal at 95.0 degrees celsius is cooled to 30.0 degrees celsius and releases 1.63 x 10^4 J of energy. What is the specific heat capacity of the metal in J/g degrees celsius?

Using the formula Q = mc(change in temp)

1.63 x 10^4 = 550g x 65 degrees x (c)

16,300 = 550g x 65 x (c)

16,300 = 35,750 x (c)

divide both sides of equation by 35,750

c = 0.4559

I know this answer is incorrect as it needs to correspond with a type of metal with that specific heat capacity, but that does not exist in my choices. I feel like I am doing this correctly in every way.

What am I missing?
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Old May 1st 2016, 09:11 AM   #2
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I think I figured it out. Needed to convert it to J/kg Celsius giving me 456, close to the specific heat capacity of 450 for Iron or Steel.

If I'm still wrong, someone please correct me.

Cheers.
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Old May 1st 2016, 01:42 PM   #3
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Specific Heat Calculation

Hi physicsboob, This post might be of interest. Check it out...

http://www.thermospokenhere.com/wp/0...heat_calc.html

Good luck, JP
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