Compression Ignition Engines: Converting kmol/kmol to kmol/kg Fuel

AI Thread Summary
The discussion focuses on converting fuel measurements for compression ignition engines from kmol/kmol to kmol/kg. The conversion involves dividing the kmol/kmol values by the molecular weight of dodecane, which is 165 g/mol. This process results in the values of 0.7027 kmol/kg and 0.7285 kmol/kg fuel. Participants clarify the reasoning behind the division, emphasizing the importance of molecular weight in the conversion. The conversation highlights the simplicity of the conversion once the underlying principle is understood.
VooDoo
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Hey guys,

Just trying to understand this piece of information I have been given. It is for a compression ignition engine.

I can see where they get the 115.954 kmol/kmol fuel and 120.204 kmol/kmol fuel from but don't understand how to change the units 0.7027 kmol/kg fuel and 0.7285 kmol/kg fuel. They seem to divide kmol/kmol fuel by 165...but don't know why.

http://img245.imageshack.us/img245/1729/chemyf4.jpg
 
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They're converting from kilomoles to kilograms, so they're dividing by the molecular weight of dodecane (165 g/mol).
 
ahh thanks a lot! Cant believe it was that simple
 

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