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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: dathrilla on June 07, 2006, 03:59:23 PM

Title: molar heat
Post by: dathrilla on June 07, 2006, 03:59:23 PM

Hi,

1 gram of C6H6 releases 10 kcal

What is the molar heat in the formation of C6H6?

The proposed answer is 11.9 kcal, can someone tell me how ypu can possibly attain this answer?

Title: Re: molar heat
Post by: Albert on June 07, 2006, 04:18:34 PM

Can you post the text of the problem? I think there's something wrong in what you wrote: 1 gram of benzene can't release 10 kcal, according to my calculations.

Title: Re: molar heat
Post by: dathrilla on June 07, 2006, 04:27:25 PM

oh ok, sorry i'm studying abroad and it's in french...

t1 gram of benzene releases while burning 10 kcal

Calculate the molar heat...

Does that sound right?

Thanks Albert

Title: Re: molar heat
Post by: dathrilla on June 07, 2006, 04:53:24 PM

Albert?

Title: Re: molar heat
Post by: dathrilla on June 07, 2006, 05:49:37 PM

?
?

Title: Re: molar heat
Post by: Albert on June 07, 2006, 06:06:57 PM

Here I am. Hey, dude, remember that I also have a life!  :)

First of all you need to write the balanced chemical equation describing the combustion of a mole of benzene.
Then, calculate the deltaH of combution (or reaction) of benzene: 10 Kcal/moles of benzene in 1g

In the end, check out the deltaH of formation of the products of combustion and calculate the deltaH of benzene.