# What temperature do I use to calculate enthalpy of combustion??? (Bomb Calorimetry)

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#1
I have just completed a bomb calorimetry lab experiment and now need to calculate deltaH for the combustion.

Using the equation: deltaH = deltaU + deltan.RT

I am confused regarding what temperature to use? Do I use the final temp, initial temp, change in temp?

Any help would be greatly appreciated
0
4 years ago
#2
(Original post by callumburns98)
I have just completed a bomb calorimetry lab experiment and now need to calculate deltaH for the combustion.

Using the equation: deltaH = deltaU + deltan.RT

I am confused regarding what temperature to use? Do I use the final temp, initial temp, change in temp?

Any help would be greatly appreciated
Try this link. http://www.dartmouth.edu/~pchem/75/pdfs/BombCal.pdf Scroll down to page 5 (Questions and Calculations)
0
4 years ago
#3
Take the final temperature away from the initial temperature and then use this change in temperature to work out your enthalpy
0
4 years ago
#4
It's the change in temperature because you are working out the enthalpy required to raise the temperature by that many degrees.
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