calculate the UFL of the gas mixture?

[robin72]

the gas (s. below) under pressure of 190 bar flow within a pipe which contain a air at atomspare pressue.
How I can calculate the UFL of the gas mixture composed:
Component Mol%
N2 1.2245
Methan 69.2390
Carbondioxide 5.7844
C2 10.6640
C3 8.0037 (Propan)
i-C4 1.1683
n-C4 2.3269
i-C5 0.6075
n-C5 0.5740
C6 0.3227
C7 0.0789
C8 0.0053

Thanks for help