Final_Exam_2008_With_Answers - ChE 102 Final Exam Fall 2008...

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ChE 102 Final Exam – Fall 2008 7 1) Estimate the number of grams of CaCl 2 which must be added to 500 grams of water to lower the freezing point to -2.0 ° C. Calcium chloride dissociates completely in water . Data: K f for water = 1.86 ° C∙m -1 A) 8.56 g B) 19.89 g C) 28.43 g D) 39.80 g E) 59.96 g 2) The osmotic pressure of blood is 7.65 atm at 37°C. How much glucose (C 6 H 12 O 6 ) in grams is required to prepare 1.0 liter of an intravenous injection solution that is to have the same osmotic pressure of blood? 3) Consider the endothermic decomposition reaction of CaCO 3 , CaCO 3( s ) CaO ( s ) + CO 2( g ) occurring at 1000 K in a closed tank. The tank containing the three components (CaCO 3 , CaO, and CO 2 ) was initially maintained at an equilibrium state. Another new equilibrium state was finally reached after introducing various disturbances described below. The three reaction components are always present in both the original and new equilibrium states. i ) More CaCO 3 will be produced if the tank volume is reduced. However, the tank pressure for the new equilibrium state remains the same as that of the original equilibrium state. ii ) More CaCO 3 will be produced if some nitrogen is injected into the tank whose volume and temperature remain unchanged. However, the partial pressure of CO 2 for the new equilibrium state remains the same as that of the original equilibrium state. iii ) More CaCO 3 will be produced if the tank temperature is reduced. However, the tank pressure for the new equilibrium state remains the same as that of the original equilibrium state. iv ) More CaO will be produced if the tank volume is increased. However, the tank pressure for the new equilibrium state remains the same as that of the original equilibrium state. How many of the above statements are correct?
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