Water vapor was removed from nitrogen gas in a packed bed at 28.3 °c by using molecular sieves. the column height was 0.268 m, with the bulk density of the solid bed being equal to 712.8 kg/m3. the initial water concentration in the solid was 0.01 kg water/kg solid and the mass velocity of the nitrogen gas was 4052 kg/m2.h. the initial water concentration in the gas was c0 = 926 x 10-6 kg water/kg nitrogen. the breakthrough data are as follows: t (h)099.29.61010.4c (kg h2o/kg n2 x106)< 0.60.62.62191235t (h)10.811.2511.512.012.512.8c (kg h2o/kg n2 x106)418630717855906926a value of c/c0 = 0.02 is desired at the break point. a) determine the break-point time, the fraction of total capacity used up to the break point, the length of the unused bed, and the saturation loading capacity of the solid. b) for a proposed column length ht = 0.40 m, calculate the break point time and fraction of total capacity used.