课程名称︰质能平衡 Elementary principles of chemical process 课程性质︰选 课程教师︰蔡伟博 开课学院：工学院 开课系所︰化工系 考试日期（年月日）︰4/12/2011 考试时限（分钟）：120 是否需发放奖励金：yes 试题 : 满分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...... -- 花退残红青杏小，燕子飞时，绿水人家绕。枝上柳棉吹又少，天涯何处无芳草。 墙里秋千墙外道，墙外行人，墙里佳人笑。笑渐不闻声渐悄，多情却被无情恼。 --

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