The molar heat of combustion for phenol

[Taryn]

You burn 103.4 mg of phenol in a calorimeter of heat capacity 1,483 J K-1 and the temperature rises by 1.83 oC. Determine the molar heat of combustion for phenol in kJ mol-1. The molar mass of phenol is 94.12 g mol-1

Ccal=deltaH/ deltaT

This is what I did.
n=.1034/94.12
=1.09859E-3mol

deltaH=(1483J/K*274.98K)/1.09859E-3
deltaH=371198.84kJ/mol

What did I do wrong... any help would be appreciated. thanks!

 

[hage567]

Your equation calls for deltaT, so that means the change in temperature.

You were given deltaT in the question. Remember that 1 degree Celcius = 1 degree Kelvin, so the difference of two temperatures will be the same on either scale.

 

[Taryn]

Hey Thanks... that's helpful... I got the answer to the answer right thanks a heap!