A fuel cell is a battery in which the reagents are continually fed and the products...
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A fuel cell is a battery in which the reagents are continually fed and the products continually removed. In the cell, the reaction occurs and electricity is produced. Fuel cells therefore convert chemical energy to electrical energy and are not heat engines. Their efficiency is therefore not limited by the Second Law of Thermodynamics and they can theoretically achieve 100% efficiency. (Note: the best efficiency in practice is only ~60% which is still far higher than the 25% efficiency of an internal combustion engine). In the fuel cell shown, a continuous flow of methane (CH4) and air (02 and N2) produce electricity plus carbon dioxide (CO2) and water (H20). The reaction stoichiometry is described by the equation: CH4 + 202--> CO2 + 2H2,0. Special membranes and catalysts are needed to promote the reaction of CH4. Electric Load CH 100% Air Feed = 16.0 kg/h Air = 300 kg/h Mol % Fuel O2 N2 Cell 21.0 79.0 100.0 Co, = ? N, = ? O, =? H,O = ? Product Based on the data given, calculate the composition of the products in P (assuming theoretical efficiency and the molecular weight of air is 29 kg/kmol). Select one: O a. y(CH4) = 0.00; y(02) = 0.016; y(N2) = 0.721; y(H20) = 0.175; y(C02) = 0.088 O b. y(CH4) = 0.016; y(02) = 0.00; y(N2) = 0.175; y(H20) = 0.721; y(CO2) = 0.088 O c. y(CH4) = 0.00; y(02) = 0.175; y(N2) = 0.721; y(H2O) = 0.016; y(cO2) = 0.088 O d. y(CH4) = 0.00; y(02) = 0.088; y(N2) = 0.721; y(H20) = 0.175; y(CcO2) = 0.016 O e. y(CH4) = 0.00; y(02) = 0.016; y(N2) = 0.175; y(H2O) = 0.721; y(CO2) = 0.088 A fuel cell is a battery in which the reagents are continually fed and the products continually removed. In the cell, the reaction occurs and electricity is produced. Fuel cells therefore convert chemical energy to electrical energy and are not heat engines. Their efficiency is therefore not limited by the Second Law of Thermodynamics and they can theoretically achieve 100% efficiency. (Note: the best efficiency in practice is only ~60% which is still far higher than the 25% efficiency of an internal combustion engine). In the fuel cell shown, a continuous flow of methane (CH4) and air (02 and N2) produce electricity plus carbon dioxide (CO2) and water (H20). The reaction stoichiometry is described by the equation: CH4 + 202--> CO2 + 2H2,0. Special membranes and catalysts are needed to promote the reaction of CH4. Electric Load CH 100% Air Feed = 16.0 kg/h Air = 300 kg/h Mol % Fuel O2 N2 Cell 21.0 79.0 100.0 Co, = ? N, = ? O, =? H,O = ? Product Based on the data given, calculate the composition of the products in P (assuming theoretical efficiency and the molecular weight of air is 29 kg/kmol). Select one: O a. y(CH4) = 0.00; y(02) = 0.016; y(N2) = 0.721; y(H20) = 0.175; y(C02) = 0.088 O b. y(CH4) = 0.016; y(02) = 0.00; y(N2) = 0.175; y(H20) = 0.721; y(CO2) = 0.088 O c. y(CH4) = 0.00; y(02) = 0.175; y(N2) = 0.721; y(H2O) = 0.016; y(cO2) = 0.088 O d. y(CH4) = 0.00; y(02) = 0.088; y(N2) = 0.721; y(H20) = 0.175; y(CcO2) = 0.016 O e. y(CH4) = 0.00; y(02) = 0.016; y(N2) = 0.175; y(H2O) = 0.721; y(CO2) = 0.088
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Related Book For
Elementary Principles of Chemical Processes
ISBN: 978-1119498759
4th edition
Authors: Richard M. Felder,? Ronald W. Rousseau,? Lisa G. Bullard
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