A rubber object is in contact with nitrogen (N2) at 298 K and 250 kPa. The solubility of nitrogen gas in rubber is 0.00156 kmol/m3-bar. The mass density of nitrogen at the interface is
(a) 0.049 kg/m3
(b) 0.064 kg/m3
(c) 0.077 kg/m3
(d) 0.092 kg/m3
(e) 0.109 kg/m3
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