Molar Heat of Combustion

nimrod_dookie · 12 Jul 2006, 9:08 PM

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I don't whether this is the right section as I'm in SA doing the SACE and our general headings are quite vague. We don't have any access to forums like these (God! We are so backwards here!). So any help would be appreciated immensely.

When 3 g of the rocket-fuel dimethyl-hydrazine (C2N2H8) is burned in a caloriometer containing 5.00kg of water the temp rises from 17.8 degrees to 22.0 degrees celcius, If the heat capacity of the caloriometer was 105 Joules per degree Celcius, calculate the molar heat of combustion of the rocket fuel. Specific heat of water is 4.18 Joules per degree celcius.

Riviet · 12 Jul 2006, 9:27 PM

Use ∆H=-mc∆T for finding the molar heat of combustion of the fuel, where m is the mass of the fuel (grams), c is the heat capacity of the object or liquid being heated and ∆T is the change in temperature.
Then I think you need to find the heat absorbed as energy by the calorimeter and add the ∆H of this to the ∆H of the fuel. Hope that helps.

nimrod_dookie · 12 Jul 2006, 9:46 PM

Thanks

hamzie · 11 Aug 2008, 5:41 PM

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Gussy Booo · 15 Aug 2009, 5:35 PM

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12 Jul 2006, 9:08 PM	#1 (permalink)
nimrod_dookie Tryhard Geek HSC: 2006 Gender: Female Join Date: Aug 2005 Posts: 115 Last Activity: 3 Apr 2009, 11:15 PM	Molar Heat of Combustion You can hide this advertisement by registering. I don't whether this is the right section as I'm in SA doing the SACE and our general headings are quite vague. We don't have any access to forums like these (God! We are so backwards here!). So any help would be appreciated immensely. When 3 g of the rocket-fuel dimethyl-hydrazine (C2N2H8) is burned in a caloriometer containing 5.00kg of water the temp rises from 17.8 degrees to 22.0 degrees celcius, If the heat capacity of the caloriometer was 105 Joules per degree Celcius, calculate the molar heat of combustion of the rocket fuel. Specific heat of water is 4.18 Joules per degree celcius.

12 Jul 2006, 9:27 PM	#2 (permalink)
Riviet . HSC: N/A Gender: Undisclosed Join Date: Oct 2005 Posts: 5,610 Last Activity: 18 Mar 2009, 3:42 PM	Re: Molar Heat of Combustion Use ∆H=-mc∆T for finding the molar heat of combustion of the fuel, where m is the mass of the fuel (grams), c is the heat capacity of the object or liquid being heated and ∆T is the change in temperature. Then I think you need to find the heat absorbed as energy by the calorimeter and add the ∆H of this to the ∆H of the fuel. Hope that helps.

12 Jul 2006, 9:46 PM	#3 (permalink)
nimrod_dookie Tryhard Geek HSC: 2006 Gender: Female Join Date: Aug 2005 Posts: 115 Last Activity: 3 Apr 2009, 11:15 PM	Re: Molar Heat of Combustion Thanks

15 Aug 2009, 5:35 PM	#5 (permalink)
Gussy Booo But if you never try, you'll never know HSC: 2010 Gender: Male Location: Sydney Join Date: Aug 2009 Posts: 174 Last Activity: 17 Nov 2009, 9:55 PM	Re: Molar Heat of Combustion hahahahah! LMFAOO !WTF ! hahahaha __________________ Maths Extension 2 Maths Extension 1 Advanced English Chemistry Physics

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