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urgent- sorption isotherm

Hi everyone,
I need an urgent help with my simulation. I used the sorption module to simulate the adsorption of H2 gas in an amorphous polymer. I obtained the isotherm in the form of the number of loading per unit cell versus fugacity. I need to convert this isotherm to the commonly shown isotherms, which are volume adsorbed (cm3/g or mmol/g or wt%) versus pressure. I searched the community and I found the N*1000/m (mass of unit cell) formula to convert but I am not sure if it's correct because the values are far greater than the experimental.