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99年 - 99 淡江大學 轉學考 質能均衡#55757

科目：轉學考-質能均衡 | 年份：99年 | 選擇題數：0 | 申論題數：4

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所屬科目：轉學考-質能均衡

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【已刪除】1. For the making of 6000 ft of acetylene (CHCH) gas at 70°F and 750 mm Hg，solid calcium carbide (CaC2）which contains 97 wt % CaC2 and 3 wt % solid inerts is used along with water. The reaction is
The final lime slurry contains water，solid inerts, and Ca(OH)2 lime. In this slurry the total wt % solids of inerts plus Ca(OH)2 is 20 %. How many lb of water must be added and how many lb of final lime slurry is produced ? Atomic weight of Ca is 40. (25%)
【已刪除】2. Formaldehyde (CH2O) is made by the catalytic oxidation of pure methanol vapor and air in a reactor. The moles from this reactor are 63.1 N2, 13.4 O2，5.9 H2O, 4.1 CH2O，12.3 CH3OH and 1.2 HCOOH. The reaction is  
A side reaction occurring is 
Calculate the mol methanol feed, mol air feed, and percent conversion of methanol to formaldehyde. (25%)
3. It is desired to produce 1000 kg/h of Na3PCO4 • I2H2O crystals from a feed solution containing 5.6 wt% Na3PO4 and traces of impurity. The original solution is first evaporated in an evapprator to a 35 wt% Na3PO4 solution and then cooled to 293 K in a crystallizer, where the hydrated crystals and a mother liquor solution are removed. One out of every 10 kg of mother liquor is discarded to waste to get rid of the impurities, and the remaining mother liquor is recycled to the evaporator. The solubility of Na3PO4 at 293 K is 9.91 wt%. Calculate the kg/h of feed solution and kg/h of water evaporated. (25%)
【已刪除】4. The waste gas from a process of 1000 g mol/h of CO at 573 K is burned at 1 atm pressure in a furnace using air at 473 K. The combustion is complete and 50% excess air is used. The flue gas leaves the furnace at 1273 K. Calculate the heat removed in the furnace.
Mean molar heat capacities of CO, O2, CO2, N2 and Air are 29.60，33.25，49.91，31.43 and 29.40 kJ/kg mol • K，respectively. (25%)