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Topic: Specific Heat/Joules/ and such, need help.  (Read 5896 times)

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Leeee

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Specific Heat/Joules/ and such, need help.
« on: October 05, 2005, 09:07:26 AM »
1. How much heat is needed to raise the temperature of 5.58 kilograms of iron from 20C to 1000C ? Specific heat of iron is 450,000 j/kg.
 

I used the formula (mass x change in temp x specific heat).

5.58 x 980 x 450,00 and got 2460780000.

^^ Would that be the correct equation to solve this problem? Im also suppose to put the answer in 3 significant digits.
« Last Edit: October 05, 2005, 09:09:08 AM by Leeee »
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Offline Donaldson Tan

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Re:Specific Heat/Joules/ and such, need help.
« Reply #1 on: October 05, 2005, 07:42:16 PM »
yes, u r correct
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Leeee

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Re:Specific Heat/Joules/ and such, need help.
« Reply #2 on: October 06, 2005, 10:11:19 AM »
Heres another:

A sample of H2O with a mass of 46.0 grams has a temperature of -58 C. How many Joules of energy are necessary to heat steam from 100 C to 114 C if the specific steam is 2.01 J/g C?

Is this one the same as before? I mean do I use (mass x change in temp x specific STEAM [in this case]). What do I do with that - 58 C?? Im confused.  ???  :-\
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Offline Borek

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Re:Specific Heat/Joules/ and such, need help.
« Reply #3 on: October 06, 2005, 10:26:05 AM »
Quote
A sample of H2O with a mass of 46.0 grams has a temperature of -58 C.

Looks like it is added just to confuse you. Seems the target was acquired :)
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Leeee

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Re:Specific Heat/Joules/ and such, need help.
« Reply #4 on: October 06, 2005, 08:29:05 PM »
 :D thanks
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