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.