8- 88.25 a. 235500 L(STP)1 mol245.5 mol CH OH(v)/minmin22.4 L(STP)n==An energy balance on the unit is then written, using Tables B.5 and B.6 for the specific enthalpies of the outlet and inlet water, respectively, and Table B.2 for the heat capacity of methanol vapor. The only unknown is the flow rate of water, which is calculated to be 21.13 kg H O/min. b. kgkJ1 min1 kW1.132373.944.7 kWmin60 sec1 kJ/sQ⎛⎞⎛⎞⎛⎞⎜⎟⎜⎟⎜⎟⎝⎠⎝⎠⎝⎠±8.26 a. 100 mol/s (30oC) 0.100 mol H2O(v)/mol 0.100 mol CO/mol 0.800 mol CO2/mol n2mol/s (30oC) 0.020 mol HO(v)/mol y2(0.980-y2m4y4kg H2O(v)/kg humid air (1-y4) kg dry air/kg humid air m3kg humid air/s (50o(0.002/1.002) kg H2O(v)/kg humid air (1.000/1.002) kgdry air/kg humid air H2O(v) onlyBasis: 100 mol gas mixture/s 5 unknowns: n2, m3, m4, y2, y4– 4 independent material balances, H2O(v), CO, CO2, dry air– 1 energy balance equation0 degrees of freedom all unknowns may be determined)(b. (1) CO balance: (100)(0.100) =(2) CO balance: (100)(0.800) =
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