Chemical Engineering Board Exam Sample Questions May 2016Full description
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A. 0.10 mol/L B. 0.10 L/mol C. 0.20 mol/L D. 0.20 L/mol 30. For the reaction: equilibrium constant at 500˚C is 62.5. If 5 moles of H2 and 5.0 moles of I2 are placed in a 10 L container at 500˚C and allowed to come to equilibrium. Calculatethe final concentration of I2. A. 0.15 mol/L B. 0.15 L/mol C. 0.10 mol/L D. 0.10 L/mol 31. For the reaction: equilibrium constant at 500˚C is 62.5. If 5 moles of H2 and 5.0 moles of I2 are placed in a 10 L container at 500˚C and allowed to come to equilibrium. Calculate the final concentration of HI. A. 0.80 L/mol B. 0.80 mol/L C. 0.10 mol/L D. 0.10 L/mol 32. At 300 K and 1 atm CO2 is 40% dissociated to CO and O2 according to the equation . Its percent dissociation when pressure is increased to 2 atm is A. 0.350 B. 0.335 C. 0.425 D. 0.375 33. A 2-L flask is filled with 0.2 mol of HI. It is allowed to reach equilibrium at hi gh temperature. If at equili brium the flask was found to contain 0.078 M HI. Calculate Kp. A. 4.2 E-6 B. 4.2 E-5 C. 1.2 E-7 D. 0.141 34. What is the solubility product of barium fluoride if 1.3 g of barium fluoride dissolve in a liter? A. 1.2 E-6 B. 1.2 E-7 C. 1.7 E-6 D. 1.7 E-7 35. The solubility of BaSO4in water is 0.00092 gram per 100 ml. Find the value of Ksp for BaSO4. A. 1.5 E-9 B. 1.5 E-8 C. 1.5 E-7 D. 1.5 E-6 36. Silver chromate, Ag2CrO4, is soluble to the extent of 0.0259 mole per liter. Calculate the solubilty product constant. A. 1.9 E-12 B. 1.9 E-11 C. 1.9 E-10 D. 1.9 E-9 Answer: 6.95 X10-5 37. Calculate the solubility of SrSO4 in grams per 100 mL of solution from its solubility product constant, Ksp =7.6 E-7 A. 0.016 g/100 mL B. 0.152 g/100 mL C. 0.202 g/100 Ml D. 0.41 g/100 mL 38. It states that the partial vapor pressure of any volatile constituents of a solution is equal to the vapor pressure of the pure constituent multiplied by the mole fraction of that constituent in solution A. Henry’s law B. Raoult’s law C. Faraday’s Law D. Dalton’s Law 39. One colligative property of solutions is its freezing point depression. Which observation will show that the solute is an electrolyte? Δtf /m A. is not a constant B. is not Kf C. is less than Kf D.is greater than Kf 40. The evidence that the solute do not freeze with the solvent is that. A. the first crystals formed are precipit ates of the solute B. the freezing point of the solution that remains a liquid is getting lower and lower as freezing proceeds C. the crystals formed could clearly be seen as that of the solution D. the freezing point is a constant 41. If common salt NaCl is dissolved in water, which of the following statements is true about the behavior of the solution relative to the behavior of pure water? A. boiling point is lowered C. melting point increases B. freezing point is decreased D. none of this is true 42. What is the freezing point of a solution that contains 0.05 mole of sugar, 0.05 mole of glycerin, and 0.05 mole of alcohol all in one liter of water? A. 0.28˚C B. 0.40˚C C. 0.65˚C D. 0.85˚C 43. Calculate the freezing point of 1.5 molal solution of NaCl in water. A. – 2.73˚C B. -5.86˚C C. -1.52˚C D. - 0.52˚C 44. Which of these 0.1 M solution will give the highest boiling at 1 atm A. table salt solution C. sugar solution B. barium chloride D. potassium chloride 45. The boiling point of chloroform can be measured with a particular apparatus with an accuracy of 0.01˚C. Calculate the numberof grams of an impurity of M=100 g/mole which be required to raise the boiling point of 50 grams of chloroform by this amount A. 0.0138 gram B. 0.0156 g C. 0.0168 g D. 0.01798 g 46. Calculate the molal boiling point constant for water that has a boiling point of 100˚C, a heat of vaporization of 539.7 cal/g, and a molecular weight of 18.02. A. 1.88˚C/molal B. 0.32˚C/molal C. 0.62˚C/molal D. 1.06˚C/molal 47. Assuming 100% dissociation of the s olutes, what would be the freezing p oint depression for an aqueo us solution that is 0.10 m in NaCl and 0.10 m in CaCl2? A. 0.93 K B. -0.93˚C C. 1.82˚C D. -1.82˚C 48. The vapor pressure of toluene is 6.811 kPa at 310 K and 24.15 kPa at 340 K. Assuming that the variation of vapor pressure p with temperature T maybe described by the expression
2 2
log =
What are the values of A and B? A. A=7.059, B=1930 K C. A=5.307, B=1930 K B. A=7.059, B=2100 K D. A=5.307, B=2100 K 49. Caustic soda can be stored in A. steel drums B. cast iron drums C. gun metal drums 50. Ability of a material to absorb energ y in deformation in the plastic range is characterized as i ts A. ductility B. toughness C. creep 51. Slow and progressive deformation of a material with time under constant stress is called A. creep B. erosion C. resilier ice 52. The pressure exerted by gases is due to the A. small size of the particles
