One question on outputting flow rate of aqueous VOC through COFT

Hello everyone,

I have a question on outputting flow rate of aqueous VOC through COFT. I established a control plane in my model and want to simulate mass discharge through the control plane. I tried to use COFT to get the flow rate (moles/s) from cell connections. The file of COFT only contained the columns of FLOH, FLO(GAS), FLO(AQ), FLO(NAPL), and it did not contained FLO(VOC)GAS and  FLO(VOC)AQ.  FLO(VOC)AQ is what I need. I also tried to use FOFT to get the XVOCW in the control plane cells and also aqueous velocity from .out file , but I do not quite understand mass fraction and how to convert the mass fraction into mass discharge (kg/s or moles/s). If anyone knows what is mass fraction and how to convert, please let me know. I appreciate your help.

Fang