Unburnt Carbon equation balancing in Boilers

[driving_seat]

Hi there,

Hope you all are doing good.

I was reading a book on boilers and burners design and had a problem in understanding some part of the text which I have attached below



The problem is I not comprehend that

1. How unburnt carbon mass can be achieved by subtracting CO2 * 12/44
2. The units of the second picture are not being achieved.

If anyone can help me in this regard, i would be very glad.

Thanks in advance.

 

[driving_seat]

I forgot to attach the file... please see it here

 

[256bits]

Answer 1. What is the atomic/molecular mass of carbon, oxygen and carbon dioxide?
Answer2. There is no second picture . If you mean equation 3-28 why do you think units are not correct?

 

[driving_seat]

Hey hello 256 bits. thanks for help.

I did a quick calculation of the first question and I got the answers.

I did the solution like this

C_total = C_burnt + C_unburnt
C_unburnt = C_total - C_burnt

As the C_burnt forms CO2, therefore C_burnt = 12/44*CO2

C_unburnt = C_total - 12/44*CO2

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As for the second question, yes I am talking about 3-28. I reattempted the solution, but could not get the balanced units. Any help in this regard is highly appreciated.