Problem with source cfx
The problem below is informed:
Expression resolves to invalid units ('kg m^3 s^1') in value set for parameter 'Total Source' in object '/FLOW:Flow Analysi1/DOMAIN:serpentina/BOUNDARY:out serpentina/BOUNDARY SOURCE/SOURCES/EQUATION SOURCE:C2H3Cl mvc.mf'. Expected units: 'kg s^1'. how could resolved this problem?? 
Um . . . divide by m^3 . . . . really?

I did not, how exactly do I do this?

Your expression has the wrong units. You are giving it a concentration per second, and it is expecting a mass per second. Fix your expression so that it gives the expected units.

barney=1[kg s^1]
fred=barney/1[m^3] Now fred is in kg m^3 s^1 But even better  Erik's suggestion is that this means the expression calculating it is probably wrong. If the units do not check out the numbers have no hope of being right so dividing by m^3 is not going to fix the real error. 
Problem i'm creating a subdomain...before a try ina a boundary...thanks a lot!!1

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