Elementary Principles Of Chemical Processes
Elementary Principles Of Chemical Processes
4th Edition
ISBN: 9781119254003
Author: Richard M. Felder And Ronald W. Rousseau
Publisher: WILEY
Question
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Chapter 9, Problem 9.19P
Interpretation Introduction

(a)

Interpretation:

To interpret the average power usage (kW) per household and also estimate the number of apartment units that could be powered with the 13kW fuel cell.

Concept introduction:

The fuel cell operates at voltage of 26volts and current of 500amps and has maximum power of 13kW. A single cell operates at 0.7volts. A fuel cell is an electrochemical device which produces direct current (DC) electricity by reacting Hydrogen (H2) with available Oxygen (O2) in the air.

Elementary Principles Of Chemical Processes, Chapter 9, Problem 9.19P , additional homework tip  1

Here,

n˙x= Molar Flowrate of Chemical Species x,n˙1= Molar Flowrate of Hydrogen that exits the anode,n˙2= Molar Flowrate of Oxygen that exits the cathode,n˙3= Molar Flowrate of Water that exits the cathode.

Interpretation Introduction

(b)

Interpretation:

To interpret the flowrates of Hydrogen and Air required in molsandSLPM(StdLmin)

Concept introduction:

The fuel cell operates at voltage of 26volts and current of 500amps and has maximum power of 13kW. A single cell operates at 0.7volts. Stoichiometric amount of moles of Hydrogen required

(nH2)stoich=IN2Fhere,I=CurrentinAmpN=NumberofCellsF=Faraday'sConstant=96485Coulombsmolofelectrons

The constant 2molelectronspermoloffuel which follows from the reaction at anode. The Hydrogen fed is 15% excess of this amount and the air is fed in 200% excess of amount required to consume all the Hydrogen.A fuel cell is an electrochemical device which produces direct current (DC) electricity by reacting Hydrogen (H2) with available Oxygen (O2) in the air.

Elementary Principles Of Chemical Processes, Chapter 9, Problem 9.19P , additional homework tip  2

Here,

n˙x= Molar Flowrate of Chemical Species x,n˙1= Molar Flowrate of Hydrogen that exits the anode,n˙2= Molar Flowrate of Oxygen that exits the cathode,n˙3= Molar Flowrate of Water that exits the cathode.

Interpretation Introduction

(c)

Interpretation:

Determine the molar flowrate of Hydrogen exiting from the anode and the molar composition of the cathode exit gas.

Concept introduction:

The fuel cell operates at voltage of 26volts and current of 500amps and has maximum power of 13kW. A single cell operates at 0.7volts. The Mole Flowrate of Hydrogen is (n˙H2)=0.113molH2s. The Volumetric Flowrate of Hydrogen in Standard Liters per Minute is 152SLPM. The Mole Flowrate of air is (n˙Air)=0.707mols. The Volumetric Flowrate of air in Standard Liters per Minute is 951SLPM.

The constant 2molelectronspermoloffuel which follows from the reaction at anode. The Hydrogen fed is 15% excess of this amount and the air is fed in 200% excess of amount required to consume all the Hydrogen .A fuel cell is an electrochemical device which produces direct current (DC) electricity by reacting Hydrogen (H2) with available Oxygen (O2) in the air.

Elementary Principles Of Chemical Processes, Chapter 9, Problem 9.19P , additional homework tip  3

Here,

n˙x= Molar Flowrate of Chemical Species x,n˙1= Molar Flowrate of Hydrogen that exits the anode,n˙2= Molar Flowrate of Oxygen that exits the cathode,n˙3= Molar Flowrate of Water that exits the cathode.

Interpretation Introduction

(d)

Interpretation:

To interpret the number of apartments could be safely powered with a 13kW fuel cell.

Concept introduction:

The fuel cell operates at voltage of 26volts and current of 500amps and has maximum power of 13kW. A single cell operates at 0.7volts. The Mole Flowrate of Hydrogen is (n˙H2)=0.113molH2s. The Volumetric Flowrate of Hydrogen in Standard Liters per Minute is 152SLPM. The Mole Flowrate of air is (n˙Air)=0.707mols. The Volumetric Flowrate of air in Standard Liters per Minute is 951SLPM .The molar flowrate of Hydrogen exit from the anode is 0.015molH2s. The molar composition of cathode exit gas are Oxygen=0.099molO2s&Nitrogen=0.558molN2s

The constant 2molelectronspermoloffuel which follows from the reaction at anode. The Hydrogen fed is 15% excess of this amount and the air is fed in 200% excess of amount required to consume all the Hydrogen .A fuel cell is an electrochemical device which produces direct current (DC) electricity by reacting Hydrogen (H2) with available Oxygen (O2) in the air.

Elementary Principles Of Chemical Processes, Chapter 9, Problem 9.19P , additional homework tip  4

Here,

n˙x= Molar Flowrate of Chemical Species x,n˙1= Molar Flowrate of Hydrogen that exits the anode,n˙2= Molar Flowrate of Oxygen that exits the cathode,n˙3= Molar Flowrate of Water that exits the cathode.

Interpretation Introduction

(e)

Interpretation:

To interpret the times when battery is being charged and the minimum total energy capacity of the battery in kWhr.

Concept introduction:

The fuel cell operates at voltage of 26volts and current of 500amps and has maximum power of 13kW. A single cell operates at 0.7volts .The constant 2molelectronspermoloffuel which follows from the reaction at anode. The Hydrogen fed is 15% excess of this amount and the air is fed in 200% excess of amount required to consume all the Hydrogen .A fuel cell is an electrochemical device which produces direct current (DC) electricity by reacting Hydrogen (H2) with available Oxygen (O2) in the air.

Elementary Principles Of Chemical Processes, Chapter 9, Problem 9.19P , additional homework tip  5

Here,

n˙x= Molar Flowrate of Chemical Species x,n˙1= Molar Flowrate of Hydrogen that exits the anode,n˙2= Molar Flowrate of Oxygen that exits the cathode,n˙3= Molar Flowrate of Water that exits the cathode.

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Chapter 9 Solutions

Elementary Principles Of Chemical Processes

Ch. 9 - Prob. 9.11PCh. 9 - Prob. 9.12PCh. 9 - In the production of many microelectronic devices,...Ch. 9 - Prob. 9.14PCh. 9 - Prob. 9.15PCh. 9 - Prob. 9.16PCh. 9 - Prob. 9.17PCh. 9 - Carbon monoxide at 25°C and steam at 150°C are fed...Ch. 9 - Prob. 9.19PCh. 9 - Prob. 9.20PCh. 9 - Ethyl alcohol (ethanol) can be produced by the...Ch. 9 - Prob. 9.22PCh. 9 - Prob. 9.23PCh. 9 - Prob. 9.24PCh. 9 - Formaldehyde is produced commercially by the...Ch. 9 - Prob. 9.26PCh. 9 - Prob. 9.27PCh. 9 - Prob. 9.28PCh. 9 - Prob. 9.29PCh. 9 - A gas mixture containing 85 mole% methane and the...Ch. 9 - Ethylene oxide is produced by the catalytic...Ch. 9 - Cumene (C6H5C3H7) is produced by reacting benzene...Ch. 9 - Ethylbenzene is converted to styrene in the...Ch. 9 - Prob. 9.34PCh. 9 - Prob. 9.35PCh. 9 - Prob. 9.36PCh. 9 - Prob. 9.37PCh. 9 - Coke can be converted into CO—a fuel gas—in the...Ch. 9 - Prob. 9.39PCh. 9 - Prob. 9.40PCh. 9 - Prob. 9.41PCh. 9 - The equilibrium constant for the ethane...Ch. 9 - You are checking the performance of a reactor in...Ch. 9 - Hydrogen is produced in the steam reforming of...Ch. 9 - Prob. 9.45PCh. 9 - Five cubic meters of a 1.00-molar aqueous sulfuric...Ch. 9 - Prob. 9.47PCh. 9 - Prob. 9.48PCh. 9 - Prob. 9.49PCh. 9 - Calcium chloride is a salt used in a number of...Ch. 9 - A dilute aqueous solution of sulfuric acid at 25°C...Ch. 9 - A 2.00 mole% sulfuric acid solution is neutralized...Ch. 9 - A 12.0-molar solution of sodium hydroxide (SG =...Ch. 9 - Citric acid (C6H8O7) is used in the preparation of...Ch. 9 - Ammonia scrubbing is one of many processes for...Ch. 9 - Various uses for nitric acid are given in Problem...Ch. 9 - A natural gas is analyzed and found to consist of...Ch. 9 - Prob. 9.58PCh. 9 - A fuel gas is known to contain methane, ethane,...Ch. 9 - A fuel gas containing 85.0 mole% methane and the...Ch. 9 - A mixture of air and a fine spray of gasoline at...Ch. 9 - The heating value of a fuel oil is to be measured...Ch. 9 - Methanol vapor is burned with excess air in a...Ch. 9 - Methane at 25°C is burned in a boiler furnace with...Ch. 9 - Methane is burned completely with 40% excess air....Ch. 9 - A gaseous fuel containing methane and ethane is...Ch. 9 - A coal contains 73.0 wt% C, 4.7% H (not including...Ch. 9 - A mixture of methane, ethane, and argon at 25°C is...Ch. 9 - Prob. 9.69PCh. 9 - Prob. 9.70PCh. 9 - Prob. 9.71PCh. 9 - A bituminous coal is burned with air in a boiler...Ch. 9 - Prob. 9.73PCh. 9 - A natural gas containing 82.0 mole% CH4and the...Ch. 9 - Prob. 9.75PCh. 9 - Liquid n-pentane at 25°C is burned with 30% excess...Ch. 9 - Methane is burned with 25% excess air in a...Ch. 9 - Methane and 30% excess air are to be fed to a...Ch. 9 - Prob. 9.79PCh. 9 - In Problem 9.79, the synthesis of methanol from...Ch. 9 - Natural gas that contains methane, ethane, and...Ch. 9 - Prob. 9.82PCh. 9 - The wastewater treatment plant at the Ossabaw...
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