GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Subject Code: 2143507
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER- IV (New) EXAMINATION - WINTER 2019
Subject Name: Fundamentals of Stoichiometry
Date: 16/12/2019
Time: 10:30 AM TO 01:00 PM
Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | (a) Explain Raoult’s law. | 03 |
| (b) The gaseous reaction A = 2B + C takes place isothermally in a constant- pressure reactor. Starting with a mixture of 75 % A and 25 % inerts (by Volume) in a specified time the volume double. | 04 | |
| (c) Calculated the enthalpy of zinc vapour at 1200 °C and atmosphere pressure, relative to solid at 10 °C. Data: Melting point of Zn =419 °C (at 1 atm) Boiling point of Zn =907 °C (at 1 atm) Mean Cp of solid Zn = 0.105 kcal/kg °C Mean Cp of liquid Zn = 0.109 kcal/kg °C Heat of fusion of Zn = 1660 kcal/kgmole Heat of vaporization of Zn = 26900 kcal/kgmole Mean Cp of Zinc vapour = 4.97 kcal/kgmole °C Atomic weight of Zn = 65.4 kg/kgmole | 07 | |
| OR | ||
| Q.1 | (a) Differentiate between: Endothermic and exothermic reactions. | 03 |
| (b) Prove that, mole fraction = Volume fraction = Pressure fraction. | 04 | |
| (c) A solution of sodium chloride in water contains 25% NaCl (by mass) at 333 K. The density of the solution is 1.129 kg/L. Find the molarity, normality and molality of the solution. Atomic mass: Na: 23, Cl:35.5 | 07 | |
| Q.2 | (a) Explain Recycle, Purge, bypass with suitable diagram | 03 |
| (b) A single effect evaporator is fed with 10000 kg/hr of weak liquor containing 15% caustic by weight and is concentrated to get thick liquor containing 40% by weight caustic (NaOH). Calculate (a). Kg/hr of water evaporated (b) kg/hr of thick liquor obtained | 04 | |
| (c) Iron pyrite is burned in 50 % excess air. The following reaction occurs: 4FeS2 + 11O2 ----- 2Fe2O3 + 8SO2 For 100 kg of iron pyrite charged, calculate following: a) The amount of air supplied in kg. b) The composition of exit gases if the percent conversion of iron pyrite is 70 % | 07 | |
| OR | ||
| Q.2 | (a) Calculate the heat of reaction for the esterification of ethyl alcohol with acetic acid if the standard heats of combustion are : ethyl alcohol: -1366.91 kJ/mol, acetic acid: -871.69 kJ/mol, ethyl acetate: -2274 kJ/mol | 03 |
| (b) Explain: Limiting Reactant, Excess reactant and percent conversion. | 04 | |
| (c) Explain : (1) Wet bulb temperature (2) Absolute humidity | 07 | |
| Q.3 | (a) 1 kg nitrogen is mixed with 3.5 m3 of hydrogen at 300 K and 101.3 kPa and sent to the ammonia converter. The product leaving the converter analyzed 13.7 % ammonia, 70.32 % hydrogen and 15.98 % nitrogen. i. Identity the limiting reactant. ii. What is the present of excess reactant? | 03 |
| (b) Define: (1) single pass conversion (2) overall conversion (3) °Be’ | 04 | |
| (c) Explain: Fundamental quantities and Derived quantities? | 07 | |
| OR | ||
| Q.3 | (a) The heat of combustion of methane, carbon and hydrogen are -890.4 kJ/mol, 393.51kJ/mol and -285.84 kJ/mol respectively. Calculate the heat of formation of methane. | 03 |
| (b) Explain sensible heat and latent heat. | 04 | |
| (c) What is an adiabatic flame temperature? State its significance and explain the procedure for its calculation. | 07 | |
| Q.4 | (a) Define the following terms with respect to humidification operation: (1) Absolute humidity (2) Relative humidity (3) Percent humidity (4) Dry bulb temperature (5) Wet bulb temperature (6) Dew point temperature (7) Humid Heat | 03 |
| (b) Explain standard heat of formation and standard heat of combustion | 04 | |
| (c) 150 L oxygen cylinder contains gas at 300 K & 10 bar. Calculate the mass of oxygen in the cylinder? | 07 | |
| OR | ||
| Q.4 | (a) Explain Dalton’s law. | 03 |
| (b) Convert 1 atm into equivalent N/m², m H2O, ft H2O, psi ,in Hg ,mm Hg, and kgf/cm². | 04 | |
| (c) Write about methods of solving material balance problems without chemical reaction. | 07 | |
| Q.5 | (a) A soap plant produced raw soap containing 50 % moisture. This is to be dried 20 % moisture before it is pressed into cakes for sale. How many 100 g soap piece can be obtained from 1000 kg of original raw soap ? | 07 |
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