Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 4th Sem New 2143507 Fundamentals Of Stoichiometry Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? IV (New) EXAMINATION ? WINTER 2019
Subject Code: 2143507 Date: 16/12/2019
Subject Name: Fundamentals of Stoichiometry
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
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.
Calculate the conversion achieved.
04
(c) 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
07
Q.2 (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
OR
(c) Calculated the enthalpy of zinc vapour at 1200
0
C and atmosphere
pressure, relative to solid at 10
0
C.
Data: Melting point of Zn = 419
0
C (at 1 atm)
Boiling point of Zn = 907
0
C (at 1 atm)
Mean Cp of solid Zn = 0.105 kcal/kg
0
C
Mean Cp of liquid Zn = 0.109 kcal/kg
0
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
0
C
Atomic weight of Zn = 65.4 kg/kgmole
07
Q.3 (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: 4 ?? ?? ?? 2 + 11?? 2 ----- 2?? ?? 2 ?? 3 + 8?? ?? 2 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.3 (a) Explain: Limiting Reactant, Excess reactant and percent conversion. 03
(b) Explain : (1) Wet bulb temperature (2) Absolute humidity 04
(c) 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
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? IV (New) EXAMINATION ? WINTER 2019
Subject Code: 2143507 Date: 16/12/2019
Subject Name: Fundamentals of Stoichiometry
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
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.
Calculate the conversion achieved.
04
(c) 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
07
Q.2 (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
OR
(c) Calculated the enthalpy of zinc vapour at 1200
0
C and atmosphere
pressure, relative to solid at 10
0
C.
Data: Melting point of Zn = 419
0
C (at 1 atm)
Boiling point of Zn = 907
0
C (at 1 atm)
Mean Cp of solid Zn = 0.105 kcal/kg
0
C
Mean Cp of liquid Zn = 0.109 kcal/kg
0
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
0
C
Atomic weight of Zn = 65.4 kg/kgmole
07
Q.3 (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: 4 ?? ?? ?? 2 + 11?? 2 ----- 2?? ?? 2 ?? 3 + 8?? ?? 2 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.3 (a) Explain: Limiting Reactant, Excess reactant and percent conversion. 03
(b) Explain : (1) Wet bulb temperature (2) Absolute humidity 04
(c) 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
07
2
excess of excess reactant? iii. What is the present conversion of the
limiting reactant?
Q.4 (a) Define: (1) single pass conversion (2) overall conversion (3)
0
Be` 03
(b) Explain: Fundamental quantities and Derived quantities? 04
(c) 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.
07
OR
Q.4 (a) Explain sensible heat and latent heat. 03
(b) What is an adiabatic flame temperature? State its significance and
explain the procedure for its calculation.
04
(c) 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
07
Q.5 (a) Explain standard heat of formation and standard heat of combustion 03
(b) 150 L oxygen cylinder contains gas at 300 K & 10 bar. Calculate the
mass of oxygen in the cylinder?
04
(c) Convert 1 atm into equivalent N/m
2
, m H2O, ft H2O, psi ,in Hg ,mm
Hg, and kgf/cm
2
.
07
OR
Q.5 (a) Explain Dalton?s law. 03
(b) Write about methods of solving material balance problems without
chemical reaction.
04
(c) 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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This post was last modified on 20 February 2020