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May 7, 2015

Homework Help: Chemistry

Posted by Sindy on Friday, October 9, 2009 at 12:29pm.

The combustion of benzoic acid releases 26.38kJ/g and is often used to calibrate a bomb calorimete. The combustion of 1.045g of benzoic acid caused the temperature of the calorimeter to rise by 5.985 degreeC.Using the same calorimeter, a sample of 0.876g of C8H18 was burned. the temp increased by 8.518 degreeC. what is the molar enthalpy of octane?

I dont know how to go about doing this question. What formula should I used I listed all the given:

Benzoic acid
deltaH= 26.318kJ/g
m= 1.045g
delta T= 5.985= 278.98K

C8H18
m= 0.876
mm= 114.224
delta T= 8.15= 281.52K
delta H= ?

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