If 15.1 g of the mixture with a volumetric composition of 45% N2, 35% O2 and 20% X gas is applying 3 atm pressure to a 5 dm3 volume vessel at 25 ° C, in which option is the molecular weight of X gas given correctly? (MN2: 28 gmol-1, MO2: 32 gmol-1)

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