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6. Coal and natural gas are two very common fossil fuels used for electricity production through combustion. Although the composition of both (especially coal) varies dramat- ically, we will treat them as pure graphite and methane, respectively. (a) Compute the heat of combustion of 1 kg 1 of coal and natural gas at 298 K using the following standard heats of formation at 298 K: AƒH°(H₂O, g) = -241.8 kJ mol¯¹, AfH (CO2, g) = -393.5 kJ mol-¹, AH(CH4, g) = −74.5 kJ mol-¹. (b) Compute AU of combustion by taking into account only the volumes of gases in these reactions. (c) In practice combustion products are exhausted at temperatures higher than 298 K. Find the amount of heat produced by burning 1 kg of coal and natural gas at 298 K if the temperature of combustion products is 800 K (hint: combust at 298K, then heat up the products). You will need the following heat capacity expressions valid over the temperature range:

6. Coal and natural gas are two very common fossil fuels used for electricity production through combustion. Although the composition of both (especially coal) varies dramat- ically, we will treat them as pure graphite and methane, respectively. (a) Compute the heat of combustion of 1 kg 1 of coal and natural gas at 298 K using the following standard heats of formation at 298 K: AƒH°(H₂O, g) = -241.8 kJ mol¯¹, AfH (CO2, g) = -393.5 kJ mol-¹, AH(CH4, g) = −74.5 kJ mol-¹. (b) Compute AU of combustion by taking into account only the volumes of gases in these reactions. (c) In practice combustion products are exhausted at temperatures higher than 298 K. Find the amount of heat produced by burning 1 kg of coal and natural gas at 298 K if the temperature of combustion products is 800 K (hint: combust at 298K, then heat up the products). You will need the following heat capacity expressions valid over the temperature range:

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
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6. Coal and natural gas are two very common fossil fuels used for electricity production through combustion. Although the composition of both (especially coal) varies dramat- ically, we will treat them as pure graphite and methane, respectively. (a) Compute the heat of combustion of 1 kg 1 of coal and natural gas at 298 K using the following standard heats of formation at 298 K: AƒH°(H₂O, g) = -241.8 kJ mol¯¹, AfH (CO₂, g) = −393.5 kJ mol−¹, AƒHª(CH4, g) = −74.5 kJ mol−¹. (b) Compute AU of combustion by taking into account only the volumes of gases in these reactions. (c) In practice combustion products are exhausted at temperatures higher than 298 K. Find the amount of heat produced by burning 1 kg of coal and natural gas at 298 K if the temperature of combustion products is 800 K (hint: combust at 298K, then heat up the products). You will need the following heat capacity expressions valid over the temperature range:
Transcribed Image Text:6. Coal and natural gas are two very common fossil fuels used for electricity production through combustion. Although the composition of both (especially coal) varies dramat- ically, we will treat them as pure graphite and methane, respectively. (a) Compute the heat of combustion of 1 kg 1 of coal and natural gas at 298 K using the following standard heats of formation at 298 K: AƒH°(H₂O, g) = -241.8 kJ mol¯¹, AfH (CO₂, g) = −393.5 kJ mol−¹, AƒHª(CH4, g) = −74.5 kJ mol−¹. (b) Compute AU of combustion by taking into account only the volumes of gases in these reactions. (c) In practice combustion products are exhausted at temperatures higher than 298 K. Find the amount of heat produced by burning 1 kg of coal and natural gas at 298 K if the temperature of combustion products is 800 K (hint: combust at 298K, then heat up the products). You will need the following heat capacity expressions valid over the temperature range:
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