TECHNOLOGICAL INSTITUTE OF THE PHILIPPINES - Manila PRE BOARD EXAM DAY 1 NAME:_______________________Date: 10/15/16 Direction: PROVIDE THE SOLUTION TO SELECT THE CORRECT ANSWER. ENCIRCLE THE CORRECT ANSWER FOR OBJECTIVE TYPE OF QUESTIONS OC 1. Which of the following is para-toluenesulfonyl chloride. [Ph = phenyl. It is assumed that the methyl group is at the #4-position. a. CH3-Ph-SO-Cl b. CH3-Ph-SO2-Cl c. CH3-Ph-SCl2-OH d. CH3-Ph-CH2-SO2-Cl CC1 2. In testing filter media for a proposed installation, a laboratory technician suspends suspends 50 g of a slightly soluble salt salt in 100 g of water. By filtration, he obtains a wet filter flask cake (precipitate) weighing 53.9 g and a clear filtrate solution. He dries the cake and finds that it weighs 49.0485 g. Calculate the solubility of the salt in g/100g of water. The concentration of the salt i n the filtrate is the same as that in the liquid which adheres to the solid precipitate. a. 1 b. 1.25 c. 2.34 d. notg TH 3. One gram mole of a gas at a temperature of 25ºC and a pressure of 1 bar (the initial state) is to be heated and compressed in a frictionless piston and cylinder to 300ºC and 10 bar (the final state). Compute the heat required when it undergoes compression in which PVγ = constant, where γ = Cp/Cv, followed by an isobaric cooling or heating, if necessary , to 300ºC. Cp is assumed to be ideal at 38 J/mole pp 63 sandler a. -522.2 J/mole b. 3031.3 J/mole c. 4742.3 J/mole d. 5795.6 J/mole CC2 4. The cinder from the combustion of iron pyrites containing 85% w FeS2 and 15% gangue carries 1% S as SO3. How many pounds of SO3 are lost in the cinder per 100 lbs of pyrite charged? a. 0.948 b. 1.656 c. 1.84 d. notg EC5. A lift station sewage pump initially costs Php20,000. Annual maintenance costs are Php300. The pump salvage value is 10 percent of the initial cost in 20 years. Using 4% interest, the annual cost of the pump is most nearly: (A) Php1,200 (B) Php1,705 (C) Php1,772 (D) Php1,840 EC6. Four alternatives for for a manufacturing process process have annual benefits and costs as shown. Alt. Benefits Costs Alt. Benefits Costs 1 58,000 50,000 3 47,000 38,000 2 51,000 41,000 4 57,000 46,000 Which is the best alternative? (A) 1 (B) 2 (C) 3 (D) 4 SR7. A shaft with a diameter of 75 mm is subjected to a torque of 461 N-m. What is the stress, MPa? a) 7.55 b) 57.5 c) 55.7 d) 5.57 OC8. The preparation of alkynes is through the following reactions EXCEPT a. Reaction of sodium acetylide with alkyl halides b. Dehydration of alcohols c. Dehalogenation of tetrahalides d. Dehydrohalogenation of alkyl halides EC9. You are buying your first car and need to borrow $16,000 over 5 years. If interest is 6%,what are your monthly payments? (A) $267 (B) $309 (C) $347 (D) $389 EV10. RA 9003 is also known as __________. A) Clean Air Act C) Pollution Control Law B) Clean Water Act D) Solid Waste Management Act
AC11. Calculate the freezing point of 0.01 M acetic acid solution, a weak electrolyte Ka = 1.8 x 10 - 5 a. - 0.12 ºC b. – 0.02 ºC c. – 0.30 ºC d. – 0.03 0.03 ºC BT12._____ are the nitrogen-containing bases which consist of a double heterocyclic nitrogen ring. a) cytosine b) purines c) uracil d) pyrimidines SR13. The ability of a material to resist being crushed is a) fatigue strength b) bending strength c) torsional strength d) compressive strength PC14. If 0.0346 grams of gas gas dissolved in 600 ml of water water at 20 ºC and 1 atm. What will be the concentration of a solution of oxygen in water at 20 ºC if the gas exerts a pressure of 400 mmHg. The vapour pressure of water at 20 ºC is 1 8mmHg. a. 3.11 x 10 -5 g/ml b. 3.25 x 10 – 5 5 g/ml
c. 4.21 x 10 – 5 g/ml d. 4.58 x 10 -5 g/ml BT15. The complete beta oxidation of a 16-carbon fatty acid would yield ____ATP molecules. a) 36 b) 72 c) 114 d) 130 EV16. Denitrification is carried out when bacteria break down nitrates and release nitrogen gas. What are these bacteria? A. cyanobacteria b. rhizobium c. anaerobic bacteria d. aerobic bacteria SR17. The formula for lateral strain is ε a. =
b. =
−
c. =
−
d. notg
TH 18. A tank of volume 0.1 m3 that contains steam at 600ºC and 1 MPa bursts. Estimate the energy of the bl ast. For comparison, the blast energy of TNT is 4600 kJ/kg. pp a. 125 kJ b. 135 kJ c. 141 kJ d. 148 kJ OC 19. An Sp2 hybrid orbital possesses a. ¼ of p character b. ½ of p character character c. 2/3 p character d. ¾ p character Linked Problems 20 - 21 CC1 20. Dry nitrogen is bubbled bubbl ed through benzene at 800 mmHg and 50°C at a rate of 10 in3/min. The nitrogen saturated with benzene vapor, leaves at 740 mmHg and 40°C at a rate of 13.85 in3/min. 20) From the data, calculate the vapor pressure of benzene at 40°C, the exit temperature. a. 78 mmHg b. 95 mmHg c. 105 mmHg d. 180.33 mmHg; 21. Calculate the lb benzene/lb dry N2 for this example. a. 0.547 b. 0.628 c. 0.894 d. notg PC 22. A uniform current deposits 0.6332g of Ag in 90 minutes. What volume of hydrogen gas at 25ºC and 740 mmHg measured over water (Pv = 23.7mmHg) would it liberate in 60 min? a.0.051 L b. 0.067L c. 0.075 L d. 0.084 L PC 23. The reaction on 2NOCl (g)→2NO(g) + Cl2(g) has an activation energy of 1.00 x 102 KJ/mol and a rate constant of 0.286 L/mol.s at 500 k. What is the rate constant at 490K? a. 0.671 L/mol.s b. 0.715 L/mol.s c. 0.175 L/mol.s d. none of the given CC2 24. Pyrite Fines containing 85% FeS2, and 15% gangue are charged to a burner. An analysis of the cinder shows 11.11% FeS2, 66.63 % Fe2O3, 2.67 % SO3 and 19.6% gangue. gangue. Air is supplied 17.33% in excess (FeS2 to SO3) at 250C, 740 mm Hg and 80% RH. If 8% of the SO3 formed is absorbed absorbed in the cinder,What is the moles of nitrogen from the air? a. 1.948 b. 2.656 c. 11.723 d. 3.1163 25. What is the the % excess excess oxygen (FeS2 to SO2) a. 46.78% b. 59.97% c. 62.46% d. 56.38% 26. How many moles of free oxygen? a. 3.11 b. 0.59 c. 1.204 d. NOTG EC27. A computerized wood lathe, costing Php17,000, will be used to make ornamental parts for sale. Receipts are estimated at Php28,000 per year with costs running Php25,000 per year. The salvage value is Php2,000 at the end of 10 years. If the MARR is is 8%, what is the present worth of this investment? (A) -Php410 (B) Php3,130 (C) Php4,060 (D) Php5,210 OC 28. A methyl group at C- 4 in cis-1,3- dimethylcyclohexane is a. axial, up b. equatorial, up c. axial, down d. equatorial, down CC2 29. The gases from a sulfur-compound burner have the following analysis: 9.86% SO2, 8.54% O2, 81.60% N2. After passage of the gases through a catalytic converter, converter, the analysis is 0.605% SO2, 4.50% O2, and 94.9% N2. a. 89.5% b. 92.38% c. 94.6% d. 96.7% MC 30.The plate is acted on by 4 parallel forces. Three of which are shown. The fourth force P and its line of action are unknown. The resultant of this force system is the couple – vector vector CR = -1100i + 1500j KN-m. Determine P and its line of action (x,y) a. (3m, 4m) b. (4m, 3m) c. (3m, 3m) d. (4m, 2m) 31. As shown in the figure above, there is a gap between the aluminum bar and the rigid slab that is supported by two copper bars. At 10°C, Δ = 0.18 mm. Neglecting the mass of the slab, calculate the stress stress in the Al rod when the temperature in the assembly is increased to 95°C. For each copper bar, A = 500 mm2, E = 120 GPa, and α = 16.8 µm/(m•°C). For the aluminum bar, A = 400 mm2, E = 70 GPa, and α = 23.1 µm/(m•° C). a. 25.65MPa b. 30.35 MPa c. 43.3 MPa d. 45.63MPa
400 KN KN CC1 32. In testing300 filter media for a proposed installation, a laboratory technician suspends 50 grams of a slightly soluble 3m salt in 100 grams of water. By 4m filtration he obtains a wet filter cake (precipitate) weighing 53.9 grams and a clear filtrate solution. He dries the cake and finds that it weighs 49.0485 g. Calculate the solubility of the salt in g/100 g of water. The concentration of the salt in the filtrate is the same as that in the liquid which adheres to the solid precipitate. a. 0.97 b. 0.98 c. 0.99 d. 1.00 BT 33. A cell that is missing lysosomes would have difficulty doing what? a. digesting food b. storing energy c. packaging proteins d. moving cytoplasm TH 34. The standard free energy of formation of HCl(g) at 25 ºC is - 22,770 cal/mole. Calculate the thermodynamic equilibrium constant for the dissociation of HCl into its elements at 25ºC. a. 5.02 x 10 – 16 b. 2 x 10 – 17 – 18 c. 3.21 x 10 d. 3.57 x 10 – 18 TH 35. Einstein’s use this theory to explain the photoelectric effect. a) Bohr’s theory b) Pauli’s Theory c) Planck’s quantum theory d) electromagnetic theory OC 36. Aromatic hydrocarbons such as benzene undergo what t ype of reactions. a. nucleophilic aromatic substitution reactions b. electrophilic addition reactions c. electrophilic aromatic substitution reactions d. electophilic aliphatic substitution reactions OC 37. Glucose-1-phosphate to starch is what type of reaction? a. decomposition b. synthesis c. catalysis d. notg BT 38. Which of the following protein structures does denaturation destroy? A) primary and secondary structures B) secondary and tertiary structures C) tertiary and quaternary structures D) secondary, tertiary, and quaternary structures OC 39. Storing produce near apples or potatoes will speed the ripening process. What chemical in apples and potatoes does this? a. ethylene b. polyphenol oxidase c. propylene d. lycopene TH 40. An adiabatic compressor receives 20 m3/min of air from the atmosphere at 20°C and compresses it to 10 MPa. Calculate the minimum power requirement. a. 317 kW b. 654 kW c. 452Kw d. 33.90 kW MC 41. The 36 m cable shown in Figure weigh 1.5 KN/m. determine the sag H and the maximum tension in the cable. a. T = 44.3 KN, H = 8.67 m b. T = 34.3 KN, H = 8.77 m c. T = 74.3 KN, H = 5.77 m d. T = 94.3 KN, H = 6.77 m 200 KN
Fi ure 42
MC 42. Locate the centroid of the shaded area a. (28.57, 36.53) b. (30.39, 39.71) c. (34.67, 40.02) d. (37.89, 42.18) BT 43. Which of the following is a definition of messenger RNA (mRNA)? a. RNA found in the ribosome, the site in cells where synthesis of proteins takes place b. RNA which carries a specific amino acid to the site of protein synthesis c. RNA which has coded genetic information d. RNA which signals cell death PC 44. Absorbance A = 0.875 of the aqueous solution of K 2PtCl6, with concentration c = 2.5×10-4 mol dm-3, was measured by a spectrophotometer in a cell with the optical path length b = 2.0 cm at the wavelength
l = 264 nm. Calculate: Transmittance (T and T%) of the measured solution at the used wavelength. a.) T = 0.024, T% = 2.40%; b) T = 0.53, T% = 5.30%; c) T = 0.095, T% = 5.50%; d) T = 0.133, T% = 13.3%; EV45. What is the indicator of sewage pollution? A. coliform B. salmonella thyphosa C. streptococci D. staphylococcus aureus EC46. Bill decides to start a 401(k) investment account beginning next year with an initial investment of Php500. His plan is to make annual investments which increase by Php100 each year. If Bi ll earns 10% on his investment, his 401(k) account will be worth how much in 15 years? (A) Php30,820 (B) Php31,760 (C) Php32,660 (D) Php33,520 EV 47. RA 8749 is also known as __________. A) Clean Air Act C) Pollution Control Law B) Clean Water Act D) Solid Waste Management Act Linked Problems 48-51 CC2 48. The analysis of a flue gas from a fuel gas containing no nitrogen is 4.62% CO2, 3.08% CO, 8.91% O2, and 83.39% N2. Calculate the following: 48. The moles of dry air supplied per mole of dry flue gas. a. 89.46 moles b. 98.45 moles c. 105.5 moles d. notg 49. Percent excess air if all the fuel is burned. a. 50% b. 58% c. 70% d. notg 50. The amount of net hydrogen burned per mole of dry flue gas a. 0.084 4 b. 0.1408 c. 0.325 d. notg 51. Pounds of fuel burned per mole of dry flue gas a. 1.21 b. 1.82 c. 2.34 d. notg EV 52. A visible concentrated growth of algae or other aquatic life/plants is called A. phytoplankton B. amoeba C. bloom D. zoo-plankton TH 53. A stream of ethylene gas at 300ºC and 45 bar is expanded adiabatically in a turbine to 2 bar. Calculate the isentropic work produced if the gas is assumed to be ideal. a. -10, 000J/mol b. -11,000 J/mole c. -12,000 J/mole d. – 13,000 J/mole CC2 54. It is coal that has lost both its moisture and VCM content a. Uncoked coal b. Partially Coked Coal b. Coked coal d. Combination of Coked & Uncoked Coal BT 55. Which of the following best describes Nylon? a. polyamide b. polyester c. polyolefin d. acrylic TH 56. How much heat is required to raise the temperature of a quantity of atmospheric air having an initial volume of 1000 ft3 from 70ºF to 150ºF. Assume barometric pressure of 14.7 psia to be constant. (Cp = 7BTU/lbmole-ºF) a. 2556 BTU b. 1445 BTU c. 985 BTU d. NOTG BT 57. How many hydrogen bonds are present in a G — C base pair and an A — T base pair, repsectively? a. 1, 2 b. 2, 2 c. 2, 3 d. 3, 2 EC58. A man loans P187,400 from a bank with interest at 5% compounded annually. He agrees to pay his obligation by paying 8 equal annual payments, the first being due at the end of the 10 th year. What is the annual payment? a) P44,982.04 b) P56,143.03 c) P62,334.62 d) P38236.04 EC59. A project requires 8 yearly investments. The initial investment at end of year one isPhp20,000 with a 5% negative gradient for the other 7 investments. Interest is 6%. The present cost of the total investment required is most nearly (A) Php98,465 (B) Php104,355(C) Php110,515 (D) Php132,000 BT 60. A double-stranded DNA molecule that contains 22%C, on a mole basis, T must also contain a. 22% G b. 22% A c. 78% A d. 78% G OC 61. The name of the electrophile that is used to nitrate benzene. a. nitrate ion b. nitronium ion c. nitrite ion d. nitrosonium ion BT 62. A polypeptide consists of 48 amino acid residues. The minimum number of base pairs in a DNA strand needed to code for this particular polypeptide would be: a) 48 b) 24 c) 16 d) 10 TH 63. What is the value of ∆H for the reaction H2(g) + ½ O2(g)→ H2O(l) at 100ºC and 1 atm? The experimental values of the average molar heat capacity at constant pressure, Cp, over the range 25ºC to 100ºC are 28.9, 29.4, and 75.5 J/K -mole, for H2(g), O2(g) and H2O(l), respectively.
a. – 285.840 kJ/mole b. – 284.24 kJ/mole c. – 283.45 kJ/mole d. – 282.12 kJ/mole PC 64. . It is the opposite of beta decay. a. alpha decay b. positron emission c. proton emission d. electron capture CC1Linked Problems 65 – 100 Air at 110°F , saturated with water vapor, is to be dehumidified. Part of the air is sent t hrough a unit where it is cooled and some water condensed. This air leaves the unit saturated at 60°F. It is then remixed with the air which bypassed the unit. The final air contains 0.02 lb water vapor/lb dry air. The vapor pressure of water at 110°F is 1.2748 psia; at 60°F it is 0.2563 psia. The total pressure is 14.7 psia. Calculate the following: 65. The pounds of water vapor per pound of dry air for the original air mixture (lb water /lb dry air). a. 0.024 b. 0.059 c. 0.062 d. 0.74 66. The ratio of pounds of dry air bypassed to pounds of dry air sent through the dehumidifier (lb water/lb dry air through). a. 0. 111 b. 0.231 c. 0.324 d. 0.365 67. The volume of wet air bypassed. a. 1876 ft3 b. 2589 ft3 c. 5489 ft3 d. 8124 ft3 EV 68. Environmental Impact Assessment Law a. PD 602 b. PD 1160 c. PD 1586 d. NOTG EC 69. An elevator system in an office building can either be refurbished or replaced. Refurbishing the elevators will cost Php55,000 and extend the life of the elevators another 20 years. Salvage value at the end of 20 years will be Php11,000. Annual maintenance costs will be Php1,000 per year. The current salvage value of the elevators is Php32,000. Replacing the elevator system will cost Php140,000, with an expected life of 50 years. Maintenance costs will be Php400 per year. Salvage value at the end of 50 years will be Php28,000. Interest is 4%. The annual cost for refurbishing the elevators is: (A) Php4,680 (B) Php5,930 (C) Php7,030 (D) Php8,240 EC66. The annual cost for replacing the elevators is: (A) Php5,840 (B) Php6,340 (C) Php6,540 (D) Php6,740 PC 70. The longest of the wavelegth of the lines for the different spectral series for electronic transition of the hydrogen atom occurs in a) Paschen series b) Balmer series c) Lyman series d) Brackett series BT 71. What sequence of bases on the second strand of DNA is complementary to the following? (5′) GCATTA (3′) a. (3′) GGTAAT (5′) b. (3′) CGTAAT (5′) c. (3′) CGTAAC (5′) d. (5′) AAATGC (3) CC2 Linked Problems 72-75 Coal is charged to a furnace at the rate of 1200 lb/hr. Analysis of the coal and flue gas shows the following: Proximate Ultimate (in part) Stack gas Moisture 1.44%w C 78.76%w CO2 10.8%v VCM 34.61%w S 0.78%w CO 0.2%v FC 57.77%w N 1.30%w O2 9.0%v Ash 6.18%w Ash 6.18%w N2 80.0%v 100.00% The dry refuse contains 4%w VCM, 21% w FC, 75% w ash. Air supplied is at 70°F, 65% saturated. The vapour pressure of water at 70°F is 0.41 psia. Barometer = 29.7 in. Hg. Pressure at the entrance to the stack is 0.5 in. H2O. Calculate the following: 72 Amount in lbs of net H2 in the fuel a. 3.23 b. 4.31 c. 4.78 d. NOTG 73. Amount in lbs of total hydrogen in the fuel a. 3.23 b. 4.31 c. 4.78 d. NOTG 74. The percent excess air supplied a. 50% b. 55% c. 68% d. Notg 75. Cubic feet of wet air per minute a. 3589 ft3 b. 4087 ft3 c. 4660 ft3 d. notg OC 76. The hybridization of carbon 3 in 2 -hexene. a. sp b. sp2 c. sp3 d. sp4 TH 77. Calculate the heat required in BTU to raise the temperature of 1 lbmole of methane from 500ºC to 1000ºC in a flow process at a pressure of 1 atm. For methane α= 3.381, β = 18.044 x 10 –3, γ = - 4.3 x 10 – 6. a. 6750 BTU b. 8750 BTU c. 5670 BTU d. NOTG SR 78. The elastic range is _________________.
a. from 0 to yield point b. from yield point to rupture pt. c. from 0 to rupture pt. D. from 0 to ultimate strength PC 79. At 25oC, the free energy of formation of H 2O (l) is -56,700 cal/mol, while that of its ionization to H+ and OH- ions is 19,050 cal/mol. What will be the reversible EMF at 25oC of the cell? H 2 (g, 1 atm); H+ || OH-; O2 (g, 1 atm) a. 0.104 V b. 0.208 V c. 0.403 V d. 0.501 V EV 80. In the environment, sulfur is found predominantly as any of the following EXCEPT a. sulfides b. oxides of sulfur c. sulfates d. organic sulfur EV 81. Which of the following is not a wastewater parameter in cement, concrete, lime and gypsum industry? A. BOD5 B. pH C. SS D. DS BT 82. The major lipid components of cell membranes are: a. sphingolipids b. fatty acids c. phosphoglycerides d. terpenoids Linked Problems 83 - 85 CC1. At 400°C and 10 atm it is found that, for the ammonia reaction N2+3H2↔2NH3, the partial pressures of the three gases are related by the expression; Kp = (P NH3)2/ (PN2)(PH2)3 Where Kp is the equilibrium constant When 1 mole of N2 and 3 moles of H2 are heated to 400°C and allowed to come to equilibrium at 10 atm, 0.148 mole of NH3 is formed. 83. How many moles of hydrogen have been consumed? a. 0.0722 b. 0.0925 c. 0.222 d. notg 84. What is the partial pressures of hydrogen in the equilibrium mixture? a. 2.404 atm b. 7.211 atm c. 0.384 atm d. notg 85. What is the value of Kp? a. 0.25 b. 0.85 c. 1 d. notg BT 86. Which of the following is not true about cholestrol? a. a steroid b. a precursor for other steroids c. produced from lanosterol d. geometry allows for ring-flips d. all are true SR . A cylindrical steel pressure vessel 400 mm in diameter with a wall thickness of 20 mm, is subjected to an internal pressure of 4.5 MN/m2. (9) Calculate the tangential stress in the steel. (10) To what value may the internal pressure be increased if the stress in the steel is limited to 120 MN/m2? 87. a. 45 MPa b. 22.5 MPa c. 12 MPa d. 8 MPa 88. a. 45 MPa b. 22.5 MPa c. 12 MPa d. 8 MPa PC 89. A 500 lb piece of iron falls from a height of 1000ft. If the atomic weight of iron is 55.5 and neglecting air resistance, what is the maximum rise in temperature of the piece of iron as it hits the hard ground? a. 9.35oF b. 11.37oF c. 14.86oF d. notg OC 90. When determining the iodine number for an unsaturated fatty acid, it is the____ of the molecule that reacts with the iodine. a) carboxylic acid b) hydroxyl group c) alkene bonds d) alkane bonds CC2 91. The cinder from the combustion of iron pyrites containing 85% w FeS2 and 15% gangue carries 1% S as SO3. How many pounds of SO3 are lost in the cinder per 100 lbs of pyrite charged? a. 0.948 b. 1.656 c. 1.84 d. notg OC 92. Honey is a natural remedy for a sore throat. It contains all of the following, except one: a. bee defensin-1, a natural antibiotic also found in royal jelly b. methylglyoxal, a chemical that inhibits bacterial protein production c. isopropyl alcohol, a natural disinfectant d. hydrogen peroxide, a natural disinfectant TH 93. If methane (assumed to be an ideal gas) is compressed adiabatically from 20ºC and 140 kPa to 560 kPa, estimate the discharge temperature of the methane. The compressor efficiency is 0.75. a. 125.5ºC b. 135.5ºC c. 145.5ºC d. 155.5ºC EC 94. A company produces transmission gears used b y several farm tractor manufacturers. The base cost of operation is Php596,700 per year. The cost of manufacturing is Php18.40 per gear. If the company sells the gears at an average price of Php37.90 each, how many gears must be sold each year to break even? (A) 15,740 (B) 18,400 (C) 30,600 (D) 32,430
PC 905 On the other hand, copper sulfate solution is blue because it absorbs out of the white light the yellow and ___, leaving the blue to be transmitted to the eye. a. red b. green c. indigo d. notg CC2 Linked Problems 96-97 A gas producer yields a gas containing 8.0% CO2, 16.3% H2, 20.6% CO, 1.0% CH4, and 54.1 % N2. The coal fired contains 70.0% C, 3.5% moisture, 7.5% ash, and negligible N and S. Tar formation can be neglected. Calculate the following quantities. 96. Cubic feet of gas produced (dsc) per pound of coal fired a. 70.7 b. 72.4 c. 73.5 d. NOTG 97. Pounds of steam decomposed per pound of coal fired a. 0.278 b. 0.372 c. 0.452 d. notg CC2 98. The type of combustible present in the coal when the ratio of the VCM over FC in the coal is equal to the ratio of VCM over FC in the refuse is a. Uncoked coal b. Partially Coked Coal b. Coked coal d. Combination of Coked & Uncoked Coal PC Linked Problems 99-100 The triple point of acetylene, C2H2, lies at a temperature of 192.4 K and pressure of 128 kPa. Assuming that t he enthalpy of vaporization of acetylene, ΔvapH = 31.3 kJ mol -1, is invariant with temperature, calculate the normal boiling te mperature. 99. a) 195 K b) 5.14 K c) 72.6 K d) 205 K 100. Work for non-flow process a) 24.78 kJ b) 86.5 kJ c) 336.5 kJ d) NOTG OC 97. A trigonal pyramidal shape has a bond angle nearer________. a. 120 b. 110 c. 90 d. 180 CC1Linked Problems 98 – 100 Air at 110°F , saturated with water vapor, is to be dehumidified. Part of the air is sent t hrough a unit where it is cooled and some water condensed. This air leaves the unit saturated at 60°F. It is then remixed with the air which bypassed the unit. The final air contains 0.02 lb water vapor/lb dry air. The vapor pressure of water at 110°F is 1.2748 psia; at 60°F it is 0.2563 psia. The total pressure is 14.7 psia. Calculate the following: 98. The pounds of water vapor per pound of dry air for the original air mixture (lb water /lb dry air). a. 0.024 b. 0.059 c. 0.062 d. 0.74 99. The ratio of pounds of dry air bypassed to pounds of dry air sent through the dehumidifier (lb water/lb dry air through). a. 0. 111 b. 0.231 c. 0.324 d. 0.365 100. The volume of wet air bypassed. a. 1876 ft3 b. 2589 ft3 c. 5489 ft3 d. 8124 ft3
MC – 7 PC -30 OC -24 BT -13 EV – 6 EC – 5 TH – 2 CC1 – CC2 – 10 SR
5 11 10 11 8 10 10 10 11 5
