Adiabatic Flame Temperature Calculation for Methane Combustion

In summary, the problem involves mixing one volume of CH4 with V volumes of air at 1 atm and 25°C, where the air is composed of 78 vol.% N2, 21 vol.% O2, and 1 vol.% Ar. The mixture is then ignited and the goal is to find the temperature of adiabatic combustion (adiabatic flame temperature). The volume of air used in this problem is 11.264. Assumptions made while solving this problem include the reaction of CH4 with oxygen only, and the heating of nitrogen and argon without any chemical reaction occurring.
  • #1
blazik
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< Moderator Note -- Thread moved here to Homework Help forum >

One volume of CH4 is mixed with V volumes of air (78 vol.% N2,21 vol.% O2,1 vol.% Ar) at 1 atm and 25°C; then the mixture is ignited. Find the temperature of adiabatic combustion (the adiabatic flame temperature). The volume of air is 11.264.

Explicitly list any assumptions you made while working on this problem.

I don't really know how to write the reaction of CH4 with the air, if anybody could give any insight on this question that'd be so helpful.
 
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  • #2
There is no such thing as reaction of methane with the air. It will react with oxygen only. Both nitrogen and argon will just be there (and they have to be heated).
 

FAQ: Adiabatic Flame Temperature Calculation for Methane Combustion

What is the definition of thermochemistry?

Thermochemistry is the branch of chemistry that deals with the study of energy changes that occur during chemical reactions and physical transformations.

How do you calculate enthalpy change?

The enthalpy change of a reaction can be calculated by subtracting the sum of the enthalpies of the reactants from the sum of the enthalpies of the products.

What is the difference between endothermic and exothermic reactions?

Endothermic reactions absorb heat from their surroundings, causing a decrease in temperature. Exothermic reactions release heat into their surroundings, causing an increase in temperature.

How does temperature affect the rate of a reaction?

A higher temperature generally increases the rate of a reaction as it provides more energy for the reactant molecules to overcome the activation energy barrier.

What is the importance of Hess's Law in thermochemistry?

Hess's Law states that the enthalpy change of a reaction is independent of the pathway taken and depends only on the initial and final states. This allows for the calculation of enthalpy changes for reactions that cannot be directly measured.

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