# Análisis 93: Determinación de la fórmula química de un combustible

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Un motor trabaja con un exceso de aire de 1.08, y genera la siguiente composición de productos de combustión en base seca:

* CO<sub>2</sub> --> 7.86 %
* H<sub>2</sub>    --> 1.70 %
* CH<sub>4</sub> (inquemados) --> 660 ppm
* N<sub>2</sub> y O<sub>2</sub> el resto

La temperatura de los productos de combustión es de 1225 ºC. Obtener:

1. La fórmula química del combustible
2. La relación molar H/C del combustible
3. La relación gravimétrica aire/combustible
4. La relación gravimétrica estequiométrica aire/combustible
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![](https://thermosuite.com/manual/93/media/image2.png) ![](https://thermosuite.com/manual/93/media/image3.png)

![](https://thermosuite.com/manual/93/media/image4.png) ![](https://thermosuite.com/manual/93/media/image5.png)

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![](https://thermosuite.com/manual/93/media/image11.png)

![](https://thermosuite.com/manual/93/media/image12.png)

![](https://thermosuite.com/manual/93/media/image13.png) ![](https://thermosuite.com/manual/93/media/image14.png)

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![](https://thermosuite.com/manual/93/media/image17.png)

![](https://thermosuite.com/manual/93/media/image18.png)

La otra solución:

![](https://thermosuite.com/manual/93/media/image19.png)

![](https://thermosuite.com/manual/93/media/image20.png)

![](https://thermosuite.com/manual/93/media/image21.png)

![](https://thermosuite.com/manual/93/media/image22.png)

![](https://thermosuite.com/manual/93/media/image23.png) ![](https://thermosuite.com/manual/93/media/image24.png)

![](https://thermosuite.com/manual/93/media/image25.png)

![](https://thermosuite.com/manual/93/media/image26.png)

![](https://thermosuite.com/manual/93/media/image27.png)

![](https://thermosuite.com/manual/93/media/image28.png)
