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Old Oct 17th 2018, 02:06 PM   #1
emma10167
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Three weeks ago, we lost our chemistry thirty teacher. Our new teacher is not extreme

We were hoping to find help with this question:

What is the final temperature of water if 2.10 grams of methane is burned (molar enthalpy change -802.5kJ/mol) to heat up 400grams of water that is initially at 22.0 degrees celsius?

Earlier in our notes it says while using n(delta)Hm = mc(delta)t, we should use either joules/grams OR kilojoules/kilograms.

In the question, our teacher used 802.5 kJ with 400 grams. We are confused, please help us find the answer.


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Old Oct 17th 2018, 02:09 PM   #2
emma10167
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This was a class-wide example question within our notes. The teacher got something around 22.6.


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Old Oct 18th 2018, 04:57 AM   #3
tylerngo
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Hi Emma!

Did you finally find help with your question? Am also interested in finding out.

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Old Oct 18th 2018, 12:48 PM   #4
emma10167
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Unfortunately, no we donít yet have a concrete answer.


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