Lets consider a simple but surprisingly accurate model of a flame. Consider the

Question

Lets consider a simple but surprisingly accurate model of a flame. Consider the combustion rxn occurring in a flame and that the surrounding air which supplies the oxygen an an equivalent amount of nitrogen (based in content of air). If all the energy released as heat by the combustion rxn goes into warming the air in the area and vaporizing the eater product we can calculate the temperature of the flame using an adianatic assumption, that is the heat does not flow beyond the immediate gases near the flame. Consider a propane gas flame such as a Bunsen burner. It will be necessary to use the temperature dependent heat capacities and integrate to a variable temperature point, the flame temperature. Plan out your approach and list assumptions you will use.

Explanation / Answer

THIS WILL HELP YOU The quantity of heat required to raise a unit mass of homogeneous material one unit in temperature along a specified path, provided that during the process no phase or chemical changes occur, is known as the heat capacity of the material. Moreover, the path is so restricted that the only work effects are those necessarily done on the surroundings to cause the change to conform to the specified path. The path is usually at either constant pressure or constant volume. In accordance with the first law of thermodynamics, heat capacity at constant pressure Cp is equal to the rate of change of enthalpy with temperature at constant pressure (?H/?T)p. Heat capacity at constant volume Cv is the rate of change of internal energy with temperature at constant volume (?U/?T)v. Moreover, for any material, the first law yields the relation shown in the equation below. Read more: http://www.answers.com/topic/heat-capacity#ixzz2LvSjwnah

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