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Topic: Molar heat of combustion  (Read 7816 times)

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Offline jubba

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Molar heat of combustion
« on: September 11, 2006, 03:57:07 AM »
Is molar heat of combustion positive or negative?
thanks
Jubba
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Offline Albert

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Re: Molar heat of combustion
« Reply #1 on: September 11, 2006, 05:38:07 AM »
What do you think?
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Offline Donaldson Tan

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Re: Molar heat of combustion
« Reply #2 on: September 11, 2006, 05:49:05 AM »
In general, the heat of combustion at RTP is negative, ie. exothermic.
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Offline jubba

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Re: Molar heat of combustion
« Reply #3 on: September 11, 2006, 05:51:23 AM »
well i thought it had no sign or it is positive since it is defined as the heat released in combustion and if it is negative then it means that heat is absorbed.
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Offline Albert

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Re: Molar heat of combustion
« Reply #4 on: September 11, 2006, 05:56:51 AM »
Quote from: jubba on September 11, 2006, 05:51:23 AM
If it is negative then it means that heat is absorbed.

No, it doesn't. If it's negative, it will mean you have an exothermic reaction.
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Offline jubba

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Re: Molar heat of combustion
« Reply #5 on: September 12, 2006, 06:34:08 AM »
i understand why enthalpy of combustion is negative. But isn't molar heat of combustion different.
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Offline Donaldson Tan

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Re: Molar heat of combustion
« Reply #6 on: September 12, 2006, 10:11:20 AM »
Quote from: jubba on September 12, 2006, 06:34:08 AM
But isn't molar heat of combustion different.

the molar heat of combustion is the enthalpy of combustion as well.
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