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3.12 This problem has several parts: a. If a portable electronic device draws 1 A current at a voltage of 2.5 V, what is the power requirement for the device? b. You have designed a fuel cell that delivers 1 A at 0.5 V. How many of your fuel cells are required to supply the above portable electronic device with its necessary voltage and current requirements? c. You would like the portable electronic device to have an operating lifetime of 100 h. Assuming 100% fuel utilization, what is the minimum amount of H, fuel (in grams) required?

3.12 This problem has several parts: a. If a portable electronic device draws 1 A current at a voltage of 2.5 V, what is the power requirement for the device? b. You have designed a fuel cell that delivers 1 A at 0.5 V. How many of your fuel cells are required to supply the above portable electronic device with its necessary voltage and current requirements? c. You would like the portable electronic device to have an operating lifetime of 100 h. Assuming 100% fuel utilization, what is the minimum amount of H, fuel (in grams) required?

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Please i need help .

solving a,b,c,d,e 

the second picture is answers key for them

3.12 This problem has several parts: a. If a portable electronic device draws 1 A current at a voltage of 2.5 V, what is the power requirement for the device? b. You have designed a fuel cell that delivers 1 A at 0.5 V. How many of your fuel cells are required to supply the above portable electronic device with its necessary voltage and current requirements? c. You would like the portable electronic device to have an operating lifetime of 100 h. Assuming 100% fuel utilization, what is the minimum amount of H, fuel (in grams) required? d. If this H2 fuel is stored as a compressed gas at 500 atm, what volume would it occupy (assume ideal gas, room temperature)? If it is stored as a metal hydride at 5 wt % hydrogen, what volume would it occupy? (Assume the metal hydride has a density of 10 g/cm?.) e. If the fuel cell used methanol (CH3OH) fuel instead of H2, what would be the minimum amount (in grams) of methanol required for 100 h of life again assuming 100% fuel utilization? Methanol has a molecular mass of 32 g/mol. What would be the corresponding volume of liquid methanol fuel (the density of liquid methanol is 0.79 g/cm?)?
Transcribed Image Text:3.12 This problem has several parts: a. If a portable electronic device draws 1 A current at a voltage of 2.5 V, what is the power requirement for the device? b. You have designed a fuel cell that delivers 1 A at 0.5 V. How many of your fuel cells are required to supply the above portable electronic device with its necessary voltage and current requirements? c. You would like the portable electronic device to have an operating lifetime of 100 h. Assuming 100% fuel utilization, what is the minimum amount of H, fuel (in grams) required? d. If this H2 fuel is stored as a compressed gas at 500 atm, what volume would it occupy (assume ideal gas, room temperature)? If it is stored as a metal hydride at 5 wt % hydrogen, what volume would it occupy? (Assume the metal hydride has a density of 10 g/cm?.) e. If the fuel cell used methanol (CH3OH) fuel instead of H2, what would be the minimum amount (in grams) of methanol required for 100 h of life again assuming 100% fuel utilization? Methanol has a molecular mass of 32 g/mol. What would be the corresponding volume of liquid methanol fuel (the density of liquid methanol is 0.79 g/cm?)?
3.12 (a) 2.5 W, (b) 5 cells, (c) 18.7 g H2, (d) 457 cm³ (compressed gas), 37. (hydride), (e) 99 g CH3OH = 78.2 cm³ CH3OH 3.13 45.9 kJ/mol porated. All rights reserved.
Transcribed Image Text:3.12 (a) 2.5 W, (b) 5 cells, (c) 18.7 g H2, (d) 457 cm³ (compressed gas), 37. (hydride), (e) 99 g CH3OH = 78.2 cm³ CH3OH 3.13 45.9 kJ/mol porated. All rights reserved.
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