The molar heat of combustion for phenol

In summary, the molar heat of combustion for phenol is 371198.84 kJ/mol. This was determined by calculating the change in temperature using the given heat capacity and the amount of phenol burned, and then using that value to solve for the molar heat of combustion using the given molar mass of phenol.
  • #1
Taryn
63
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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!
 
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  • #2
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.
 
  • #3
Hey Thanks... that's helpful... I got the answer to the answer right thanks a heap!
 

1. What is the molar heat of combustion for phenol?

The molar heat of combustion for phenol is the amount of energy released when one mole of phenol is completely burned in excess oxygen under standard conditions. It is typically measured in kilojoules per mole (kJ/mol).

2. How is the molar heat of combustion for phenol determined?

The molar heat of combustion for phenol is determined experimentally by measuring the change in temperature of a known amount of phenol as it is burned in a bomb calorimeter. This method allows for a precise measurement of the heat released during the combustion reaction.

3. What factors can affect the molar heat of combustion for phenol?

The molar heat of combustion for phenol can be affected by factors such as the purity of the sample, the temperature at which the reaction takes place, and the presence of impurities or additives. It may also vary slightly depending on the specific experimental conditions used to measure it.

4. How does the molar heat of combustion for phenol compare to other common fuels?

The molar heat of combustion for phenol is relatively low compared to other common fuels, such as gasoline or natural gas. However, it is still a significant source of energy and is commonly used as a fuel in some industrial processes.

5. What is the practical application of knowing the molar heat of combustion for phenol?

Knowing the molar heat of combustion for phenol allows for the calculation of its energy content, which is important in industries that use phenol as a fuel source. It can also be used in the development of more efficient and cleaner burning fuels, as well as in the analysis of environmental impacts of phenol combustion.

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