A power plant is driven by the combustion of a complex fossil fuel having the formula C 11 H 7 S. Assume the air supply is composed of only N 2 and O 2 with a molar ratio of 3.76:1.00, and the N 2 remains unreacted. In addition to the water produced, the fuel’s C is completely combusted to CO 2 and its sulfur content is converted to SO 2 . In order to evaluate gases emitted at the exhaust stacks for environmental regulation purposes, the nitrogen supplied with the air must also be included in the balanced reactions. a Including the N 2 supplied m the air, write a balanced combustion equation for the complex fuel assuming 100% stoichiometric combustion (i.e., when there is no excess oxygen in the products and the only C-containing product is CO 2 ). Except in the case of N 2 , use only integer coefficients. b Including N 2 supplied in the air, write a balanced combustion equation for the complex fuel assuming 120% stoichiometric combustion (i.e., when excess oxygen is present in the products and the only C-containing product is CO 2 ). Except in the case of use only integer coefficients c Calculate the minimum mass (in kg) of air required to completely combust 1700 kg of C 11 H 7 S. d Calculate the air/fuel mass ratio, assuming 100% stoichiometric combustion. e Calculate the air/fuel mass ratio, assuming 120% stoichiometric combustion.
A power plant is driven by the combustion of a complex fossil fuel having the formula C 11 H 7 S. Assume the air supply is composed of only N 2 and O 2 with a molar ratio of 3.76:1.00, and the N 2 remains unreacted. In addition to the water produced, the fuel’s C is completely combusted to CO 2 and its sulfur content is converted to SO 2 . In order to evaluate gases emitted at the exhaust stacks for environmental regulation purposes, the nitrogen supplied with the air must also be included in the balanced reactions. a Including the N 2 supplied m the air, write a balanced combustion equation for the complex fuel assuming 100% stoichiometric combustion (i.e., when there is no excess oxygen in the products and the only C-containing product is CO 2 ). Except in the case of N 2 , use only integer coefficients. b Including N 2 supplied in the air, write a balanced combustion equation for the complex fuel assuming 120% stoichiometric combustion (i.e., when excess oxygen is present in the products and the only C-containing product is CO 2 ). Except in the case of use only integer coefficients c Calculate the minimum mass (in kg) of air required to completely combust 1700 kg of C 11 H 7 S. d Calculate the air/fuel mass ratio, assuming 100% stoichiometric combustion. e Calculate the air/fuel mass ratio, assuming 120% stoichiometric combustion.
Author: Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
A power plant is driven by the combustion of a complex fossil fuel having the formula C11H7S. Assume the air supply is composed of only N2 and O2 with a molar ratio of 3.76:1.00, and the N2 remains unreacted. In addition to the water produced, the fuel’s C is completely combusted to CO2 and its sulfur content is converted to SO2. In order to evaluate gases emitted at the exhaust stacks for environmental regulation purposes, the nitrogen supplied with the air must also be included in the balanced reactions.
a Including the N2 supplied m the air, write a balanced combustion equation for the complex fuel assuming 100% stoichiometric combustion (i.e., when there is no excess oxygen in the products and the only C-containing product is CO2). Except in the case of N2, use only integer coefficients.
b Including N2 supplied in the air, write a balanced combustion equation for the complex fuel assuming 120% stoichiometric combustion (i.e., when excess oxygen is present in the products and the only C-containing product is CO2). Except in the case of use only integer coefficients
c Calculate the minimum mass (in kg) of air required to completely combust 1700 kg of C11H7S.
d Calculate the air/fuel mass ratio, assuming 100% stoichiometric combustion.
e Calculate the air/fuel mass ratio, assuming 120% stoichiometric combustion.
(a)
Expert Solution
Interpretation Introduction
Interpretation:
The balanced equation for the combustion reaction should be written.
Concept introduction:
Balanced equation:
A balanced chemical equation is an equation which contains same elements in same number on both the sides (reactant and product side) of the chemical equation thereby obeying the law of conservation of mass.
The equation for a reaction, which has same number of atoms and charge of the ions in both reactants and product sides is known as balanced equation.
Answer to Problem 3.141QP
The balanced equation for the combustion reaction is,
Products of combustion reaction is CO2, H2O and SO2
Frist arrange the equation for the combustion reaction is,
C11H7S+O2→CO2+H2O +SO2
Add the 11 coefficient for balancing carbon atom of CO2
C11H7S+O2→11CO2+H2O +SO2
Multiply the whole reaction 2 for balancing Hydrogen atom of C11H7S
2C11H7S+O2→22CO2+H2O +2SO2
Add the 7 coefficient for balancing carbon atom of H2O
2C11H7S+O2→22CO2+7H2O +2SO2
In product side has 55 Oxygen atoms so add 552 in reactant side.
2C11H7S+552O2→22CO2+7H2O +2SO2
Modify the 552 into whole number by multiplying the reaction in to two
4C11H7S+55O2→44CO2+14H2O +4SO2
Add the nu reacted N2 and its coefficient. The ratio of air is O2and N2=3.76:l.0 therefore the coefficient N2 is 55×3.76 and add this into both side of the reaction to get the balanced equation for given combustion reaction.
The balanced equation for the combustion reaction was written.
(b)
Expert Solution
Interpretation Introduction
Interpretation:
The balanced equation for the 120% combustion reaction should be written.
Concept introduction:
Balanced equation:
A balanced chemical equation is an equation which contains same elements in same number on both the sides (reactant and product side) of the chemical equation thereby obeying the law of conservation of mass.
The equation for a reaction, which has same number of atoms and charge of the ions in both reactants and product sides is known as balanced equation.
Answer to Problem 3.141QP
The balanced equation for the 120% combustion reaction is,
Products of combustion reaction is CO2, H2O and SO2
Frist arrange the equation for the combustion reaction is,
C11H7S+O2→CO2+H2O +SO2
Add the 11 coefficient for balancing carbon atom of CO2
C11H7S+O2→11CO2+H2O +SO2
Multiply the whole reaction 2 for balancing Hydrogen atom of C11H7S
2C11H7S+O2→22CO2+H2O +2SO2
Add the 7 coefficient for balancing carbon atom of H2O
2C11H7S+O2→22CO2+7H2O +2SO2
In product side has 55 Oxygen atoms so add 552 in reactant side.
2C11H7S+552O2→22CO2+7H2O +2SO2
Modify the 552 into whole number by multiplying the reaction in to two
4C11H7S+55O2→44CO2+14H2O +4SO2
Add the nu reacted N2 and its coefficient. The ratio of air is O2and N2=3.76:l.0 therefore the coefficient N2 is 55×3.76 and add this into both side of the reaction to get the balanced equation for given combustion reaction.
To calculate the minimum mass (in kg) of air required to completely combust 1700 kg of C11H7S.
From the above calculation, the air/fuel mass ratio of 100% combustion reaction is 11.03gairfuel
Therefore the air/fuel mass ratio of 100% combustion is multiplied with given mass (1700 kg) to give the minimum mass (in kg) of air required to completely combust 1700 kg of C11H7S.
=1700kgfuel×11.03gofair1goffuel=1.9×104kg
The minimum mass (in kg) of air required to completely combust 1700 kg of C11H7S is 1.9×104kg.
Conclusion
The minimum mass (in kg) of air required to completely combust 1700 kg of C11H7S was calculated.
(d)
Expert Solution
Interpretation Introduction
Interpretation:
The air/fuel mass ratio of 100% combustion reaction should be calculated.
Answer to Problem 3.141QP
The air/fuel mass ratio of 100% combustion reaction is 11.03gairfuel
Explanation of Solution
The balance the given combustion reaction.
The balanced equation for given 100% combustion reaction is,
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.