Maximum flame temperature during Combustion of CH4

  • Thread starter duchuy
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  • #1
duchuy
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Homework Statement:
Combustion of CH4 at constant pressure (P=1bar).
Relevant Equations:
CH4 (g) + 2O2 (g) --> CO2 (g) + 2H2O (g)
Enthalpy of reaction = -803 kJ.mol-1
Hi, I have to calculate the maximum flame temperature of the reaction above. The answer is 4805K but I didn't manage to obtain that answer. Please help me find my error, thank you so much! The values of C are below the solution attempt.
252494934_212766377526123_3956713850276630744_n.jpg
valeurs.PNG
 

Answers and Replies

  • #2
cmb
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What does a flame that you can see consist of?
 
  • #3
mjc123
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Where you have written (Tf - 298)2, that should be (Tf2 - 2982). Correcting this gives 4805 K. But who says this is the right answer? Why do you think they give you the heat capacity of N2?
 
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  • #4
duchuy
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Where you have written (Tf - 298)2, that should be (Tf2 - 2982). Correcting this gives 4805 K. But who says this is the right answer? Why do you think they give you the heat capacity of N2?
Thank you sir! My excuses for my math. They gave the heat capacity of N2 for the following question that asks about the combustion in 20% O2 and 80% N2.
This question is for combustion in 100% O2.
But again, thank you so much for your help!
By the way, I found 2280K for the combustion in 20% O2 and 80% N2, that should be correct right?
 

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