(W 2010 Final )Which requires more heat?

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Kiara1F
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Joined: Fri Sep 25, 2015 3:00 am

(W 2010 Final )Which requires more heat?

Postby Kiara1F » Fri Mar 17, 2017 7:56 pm

Hey so I have a question regarding problem number 1B on the Winter 2010 Final

"On heating the following pairs from 10 to 20 Celsius, which requires more heat:

1kg water or 1kg copper ?
Answer: 1kg of water
- why is it water and not copper? How dow we tell? Does atomic mass have anything to do with it? Cu is way larger than water ..

1 mole H2(g) or 1 mole butane gas
Answer: 1 mole of butane gas


Thanks!

Chem_Mod
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Re: (W 2010 Final )Which requires more heat?

Postby Chem_Mod » Sat Mar 18, 2017 1:57 am

Regarding 1kg water vs 1kg copper: You have to look at the specific heat of the substance. Multiply the specific heat of water by 1kg, and multiply the specific heat of copper by 1kg. The greater number in Joules will show you the amount of energy needed to heat up each substance. In general, the trend is that a higher specific heat means that more energy is required to change the temperature of a substance by 1 degree C or K.

Sue_Park_2D
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Joined: Wed Sep 21, 2016 2:57 pm

Re: (W 2010 Final )Which requires more heat?

Postby Sue_Park_2D » Sat Mar 18, 2017 5:09 pm

Does the one mole of butane require more heat because it is larger in terms of atomic mass?


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