課程名稱︰質能平衡 Elementary principles of chemical process 課程性質︰選 課程教師︰蔡偉博 開課學院：工學院 開課系所︰化工系 考試日期（年月日）︰4/12/2011 考試時限（分鐘）：120 是否需發放獎勵金：yes 試題 : 滿分110 1. (15 points) The density of a fluid is given by empirical equation d=(A+BT)*e^(CP) , d= density in g/cm^3, T= temperature in degree C, P = pressure in atm (a) The equation is dimensionally consistent, units of A,B,C=? (6 points) (b) In the unit above, A=1.096,B=0.00086,C=0.0000953, find A,B,C if d is expressed in lb/ft^3, T in degree R, P in lbf/in^2 (9 points) 2. (20 points) A water solution contains 60% Na2S2O2 together with 1% soluble impurity. Upon cooling to 10 degree C, Na2S2O2。5H2O crystallizes out. The solubility of this hydrate is 1.4 Na2S2O2 lb/lb free water. The crystals removed carry as adhering solution 0.06 lb solution/lb crystals. When dried to remove the remaining water (but not the water of hydration), the final dry Na2S2O2。5H2O crystals must not contain more than 0.1% impurity. To meet this specification, the original solution, before cooling, if futher diluted with water. On the basis of 100 lb of original solution, calculate (a) The amount of water added before cooling (b) The percentagerecovery of the Na2S2O2 in the dried hydrated crystals. (10 points each) 3. (15 points) The emissive power of a blackbody depends on the fuurth power of the temperature and is given by W=AT^4, where W= emission power in Btu/(ft^2)(hr) A= Stefan-Boltzman constant,0.171*10^(-8) Btu/(ft^2)(hr)(degree R) T= temperature in degree R What is the value of A in the units J/(m^2)(s)(K^4)? To be continued...... -- 花退殘紅青杏小，燕子飛時，綠水人家繞。枝上柳棉吹又少，天涯何處無芳草。 牆裡鞦韆牆外道，牆外行人，牆裡佳人笑。笑漸不聞聲漸悄，多情卻被無情惱。 --

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