Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 4th Sem New 2143507 Fundamentals Of Stoichiometry Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (NEW) EXAMINATION ? WINTER 2018
Subject Code:2143507 Date:12/12/2018
Subject Name:Fundamentals of Stoichiometry
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Explain: Fundamental quantities and Derived quantities? 03
(b) The thermal conductivity of an insulating brick is 0.15 Btu/(ft.h.
?
F ). Express the
thermal conductivity in SI units
04
(c) The average molar mass of a flue gas sample is calculated by two different
engineers. One engineer uses the correct molar mass of 28 for N 2 and determines
the average molar mass to be 30.08, the other engineer, using an incorrect value
of 14, calculates the average molar mass to be 18.74. (i) Calculate the volume %
of nitrogen in the flue gases, (ii) If the remaining components of the flue gases are
CO 2 and O 2, calculate the volume % each of them
07
Q.2 (a) Explain : Dalton?s law and Raoult?s law 03
(b) City gas has composition by volume expressed as : CH 4= 78 % , C 2H 6 = 12% and
C 3H 8= 10%, calculate the gas density in kg/m
3
under 585 psig and 37
o
C
04
(c) Bottled liquid gas of the following composition is sold for house hold use:
Components Mole% Vapour presure. at 30?C (bar)
n- butane 50 3.4
Propane 45 10.8
Ethane 5 46.6
Determine (1) The pressure of the system and the equilibrium vapour composition
at 30?C, and (2) if all ethane is removed from the liquid, the pressure of the system
and the vapour composition at 30?C. Assume Raoult?s law is applicable
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (NEW) EXAMINATION ? WINTER 2018
Subject Code:2143507 Date:12/12/2018
Subject Name:Fundamentals of Stoichiometry
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Explain: Fundamental quantities and Derived quantities? 03
(b) The thermal conductivity of an insulating brick is 0.15 Btu/(ft.h.
?
F ). Express the
thermal conductivity in SI units
04
(c) The average molar mass of a flue gas sample is calculated by two different
engineers. One engineer uses the correct molar mass of 28 for N 2 and determines
the average molar mass to be 30.08, the other engineer, using an incorrect value
of 14, calculates the average molar mass to be 18.74. (i) Calculate the volume %
of nitrogen in the flue gases, (ii) If the remaining components of the flue gases are
CO 2 and O 2, calculate the volume % each of them
07
Q.2 (a) Explain : Dalton?s law and Raoult?s law 03
(b) City gas has composition by volume expressed as : CH 4= 78 % , C 2H 6 = 12% and
C 3H 8= 10%, calculate the gas density in kg/m
3
under 585 psig and 37
o
C
04
(c) Bottled liquid gas of the following composition is sold for house hold use:
Components Mole% Vapour presure. at 30?C (bar)
n- butane 50 3.4
Propane 45 10.8
Ethane 5 46.6
Determine (1) The pressure of the system and the equilibrium vapour composition
at 30?C, and (2) if all ethane is removed from the liquid, the pressure of the system
and the vapour composition at 30?C. Assume Raoult?s law is applicable
07
OR
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2
(c) A solution contains 50% Benzene, 30% Toluene and 20% Xylene by weight at a
temperature of 100 ?C. The vapours are in contact with solution. Calculate the
total pressure and molar % compositions of liquid and the vapour. The vapour
pressures and the molecular weights are as follows:
Components Vapour pressure at 100
o
C Mol. weight
Benzene 1340 mm Hg 78
Toluene 560 mm Hg 92
Xylene 210 mm Hg 106
Assume Raoult?s law is applicable
07
Q.3 (a) Define : Mass % , Mole % and ppm 03
(b) The average molecular weight of the mixture of oxygen and sulphur dioxide is
found to be 44.8. For 5 kg of this mixture at 298K and 200kPa. Calculate
(a) The partial pressure of oxygen
(b) The volume of mixture
(c) The density at the STP condition
04
(c) A solution of sodium chloride in water contains 20% NaCl (by mass) at 333 K.
The density of the solution is 1.127 kg/L. Find the molarity, normality and molality
of the solution. Atomic mass: Na: 23, Cl:35.5
07
OR
Q.3 (a) Explain: Limiting Reactant, Excess reactant and percent conversion. 03
(b) 1 kg nitrogen is mixed with 3.5 m
3
of hydrogen at 300 K and 101.3 kPa and sent
to the ammonia converter. The product leaving the converter analysed 13.7 %
ammonia, 70.32 % hydrogen and 15.98 % nitrogen.
(a) Identity the limiting reactant.
(b) What is the present excess of excess reactant?
(c) What is the present conversion of the limiting reactant?
04
(c) Calculate the following for the reaction:
C 2H 4 + 2Cl 2 ? C 2HCl 3 + H 2 + HCl
(1) The stoichiometric ratio of Cl 2 to C 2H 4
(2) If 4 kmol Cl 2 is used per kmol of C 2H 4, find the % excess Cl 2
(3) The amount of HCl produced from 50 kg C 2H 4 assuming reaction goes to
completion.
07
Q.4 (a) Discuss methods of solving material balance problems without chemical reaction. 03
(b) 2000 kg of wet solids containing 70% solids by weight are fed to tray dyer where
it is dried by hot air. The product finally obtained is found to contain 1% moisture
by weight, calculate: (1) kg of water removed from wet solids (2) kg of the product
obtained.
04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (NEW) EXAMINATION ? WINTER 2018
Subject Code:2143507 Date:12/12/2018
Subject Name:Fundamentals of Stoichiometry
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Explain: Fundamental quantities and Derived quantities? 03
(b) The thermal conductivity of an insulating brick is 0.15 Btu/(ft.h.
?
F ). Express the
thermal conductivity in SI units
04
(c) The average molar mass of a flue gas sample is calculated by two different
engineers. One engineer uses the correct molar mass of 28 for N 2 and determines
the average molar mass to be 30.08, the other engineer, using an incorrect value
of 14, calculates the average molar mass to be 18.74. (i) Calculate the volume %
of nitrogen in the flue gases, (ii) If the remaining components of the flue gases are
CO 2 and O 2, calculate the volume % each of them
07
Q.2 (a) Explain : Dalton?s law and Raoult?s law 03
(b) City gas has composition by volume expressed as : CH 4= 78 % , C 2H 6 = 12% and
C 3H 8= 10%, calculate the gas density in kg/m
3
under 585 psig and 37
o
C
04
(c) Bottled liquid gas of the following composition is sold for house hold use:
Components Mole% Vapour presure. at 30?C (bar)
n- butane 50 3.4
Propane 45 10.8
Ethane 5 46.6
Determine (1) The pressure of the system and the equilibrium vapour composition
at 30?C, and (2) if all ethane is removed from the liquid, the pressure of the system
and the vapour composition at 30?C. Assume Raoult?s law is applicable
07
OR
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2
(c) A solution contains 50% Benzene, 30% Toluene and 20% Xylene by weight at a
temperature of 100 ?C. The vapours are in contact with solution. Calculate the
total pressure and molar % compositions of liquid and the vapour. The vapour
pressures and the molecular weights are as follows:
Components Vapour pressure at 100
o
C Mol. weight
Benzene 1340 mm Hg 78
Toluene 560 mm Hg 92
Xylene 210 mm Hg 106
Assume Raoult?s law is applicable
07
Q.3 (a) Define : Mass % , Mole % and ppm 03
(b) The average molecular weight of the mixture of oxygen and sulphur dioxide is
found to be 44.8. For 5 kg of this mixture at 298K and 200kPa. Calculate
(a) The partial pressure of oxygen
(b) The volume of mixture
(c) The density at the STP condition
04
(c) A solution of sodium chloride in water contains 20% NaCl (by mass) at 333 K.
The density of the solution is 1.127 kg/L. Find the molarity, normality and molality
of the solution. Atomic mass: Na: 23, Cl:35.5
07
OR
Q.3 (a) Explain: Limiting Reactant, Excess reactant and percent conversion. 03
(b) 1 kg nitrogen is mixed with 3.5 m
3
of hydrogen at 300 K and 101.3 kPa and sent
to the ammonia converter. The product leaving the converter analysed 13.7 %
ammonia, 70.32 % hydrogen and 15.98 % nitrogen.
(a) Identity the limiting reactant.
(b) What is the present excess of excess reactant?
(c) What is the present conversion of the limiting reactant?
04
(c) Calculate the following for the reaction:
C 2H 4 + 2Cl 2 ? C 2HCl 3 + H 2 + HCl
(1) The stoichiometric ratio of Cl 2 to C 2H 4
(2) If 4 kmol Cl 2 is used per kmol of C 2H 4, find the % excess Cl 2
(3) The amount of HCl produced from 50 kg C 2H 4 assuming reaction goes to
completion.
07
Q.4 (a) Discuss methods of solving material balance problems without chemical reaction. 03
(b) 2000 kg of wet solids containing 70% solids by weight are fed to tray dyer where
it is dried by hot air. The product finally obtained is found to contain 1% moisture
by weight, calculate: (1) kg of water removed from wet solids (2) kg of the product
obtained.
04
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3
(c) A solution of ethyl alcohol containing 8.6% alcohol is fed at the rate of 1000
kg/hr to a continuous distillation column. The product (distillate) is a solution
containing 95.5% alcohol. The waste solution from the column carries 0.1% of
alcohol. All percentages are by mass. Calculate (a) the mass flow rates of top and
bottom products in kg/h and (b) the percentage loss of alcohol
07
OR
Q.4 (a) Define: Solubility, Vapour pressure and Boiling point 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) The feed to a continuous fractionating column analyzed by weight 28% benzene
and 72% toluene. The analysis of the distillate shows 52 % (by weight) benzene
and 5 % (by weight) benzene was found in the bottom product. Calculate the
amount of distillate and bottom product per 1000 kg of feed per hour. Also
calculate the percent recovery of benzene
07
Q.5 (a) Define: heat capacity, sensible heat and latent heat 03
(b) Pure methane is heated from 303 K to 523 K at atmospheric pressure. Calculate
the heat added per kmol methane using the following data:
Cp= 26.586 + 7.5820 ? 10
-3
T ? 1.1200 ? 10
-6
T
2
, kJ/(kmol-K)
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.5 (a) Define : Adiabatic reaction and adiabatic flame temperature 03
(b) Calculate the theoretical flame temperature for CO when it is burnt with 100 %
excess air. Both the reactants are at 373K. The heat capacities (J/mol.K) (may be
assumed constant) are 29.23 for CO, 34.83 for O 2 ,33.03 for N 2 and 53.59 for CO 2.
The standard heat of combustion at 298K is -282.99 kJ/mol CO.
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
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This post was last modified on 20 February 2020