课程名称︰质能平衡 课程性质︰必 课程教师︰蔡伟博 开课学院：工 开课系所︰化工 考试日期（年月日）︰100/6/21 考试时限（分钟）：120 是否需发放奖励金：yes （如未明确表示，则不予发放） 试题 : Pick 5 out of 6 questions. 25 points each. 1. (a) Calculate the bubble point of a liquid mixure of 0.7 mol fr. n-hexane and 0.3 mole fr. n-pentane at 10 atm. (b) Calculate the dew point of a vapor mixure of 0.7 mol fr. n-hexane and 0.3 mole fr. n-pentane at 10 atm. 2. (a) Calculate delta H, delta V, delta T changes for 1lb of saturated vapor of n-butane going from 2 atm to 20 atm (saturated) (b) Calculate the enthalpy change for 10 lb of butane going from a volume of 2.5 ft^3 @360 F to saturated liquid at 10 atm. 3. Feedwater heaters are used to increase the efficiency of steam power plants. A particular heater is used to preheat 10kg/s of boiler feed water from 20 degree C to 188 degree C @ 1200 kPa by mixing it with saturated steam bled from a turbine @ 1200 kPa, 188 degree C. the heater loses heat @ 50J/ gram exiting mixure. What fraction of the exit stream is steam? 4. Calculate the adiabatic flame tem[eratire of C3H6(g) @ 1atm when burned with 30% excess air, and tje reactamts enter @ 50 degree C. to be continued... -- 人生到处知何似? 应似飞鸿踏雪泥。泥上偶然留指爪,鸿飞那复计东西。 老僧已死成新塔, 坏壁无由见旧题。往日崎岖君知否？路长人困蹇驴嘶。 --

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