conversions for gas permeability

Hi,
Thanks for fielding this question. I want to compare the gas permeability of 2 different plastic films. The manufacturers use different units for the gas measurements but I would like to compare the two. Both measurements were over a 24-hr period and per square meter at similar RH%.

O2.......100 cc
O2.......26,302 g

CO2.......150 cc
CO2.......67,900 g

N2.......13 cc
N2.......4,410 g

Thank you very much,
Rick