# Análisis 88: Mezcla másica de aire+fuel en reactor cerrado con la composición molar del flue-gas

{% hint style="info" %}
Una mezcla de aire y metano (0.5 kg) está inicialmente a 600 K y 20 bar, siendo quemada a volumen constante. ¿Cuál es el valor del coeficiente de exceso de aire?

Considerando el equilibrio químico de las siguientes especies:

* CO<sub>2</sub>  --> 0.684778 moles
* CO    --> 0.315222 moles
* H<sub>2</sub>O  --> 1.876280 moles
* H<sub>2</sub>     --> 0.123718 moles
* O<sub>2</sub>     --> 0.019470 moles
* N<sub>2</sub>     --> 6.768000 moles

Determinar la temperatura alcanzada por los productos de combustión considerando la reacción química de equilibrio "water-gas", entropía generada y comprobar que las reacciones de equilibrio y el balance de energía se verifican.
{% endhint %}

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Número de moles totales = 9.787468 moles

Fracciones molares de humos húmedos:

* YCO = 3.2206 %
* YCO<sub>2</sub> = 6.9964 %
* YH<sub>2</sub>O = 19.170 %
* YH<sub>2</sub> = 1.264 %
* YO<sub>2</sub> = 0.1989 %
* YN<sub>2</sub> = 69.149 %

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