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The fuel in the form of biogas (65%-mol CH4 and 35%-mol CO2) is burned in a furnace. Determine the Low Heating Value (LHV) and High Heating Value (HHV) of the fuel in units of kJ/kmol if the standard forming enthalpy is (DHf,298 K) CH4, H2O(g), H2O(l), and CO2, respectively -74.8 kJ/mol-241.8, kJ/mol, -285.8 kJ/mol, and -393.5 kJ/mol!

The fuel in the form of biogas (65%-mol CH4 and 35%-mol CO2) is burned in a furnace. Determine the Low Heating Value (LHV) and High Heating Value (HHV) of the fuel in units of kJ/kmol if the standard forming enthalpy is (DHf,298 K) CH4, H2O(g), H2O(l), and CO2, respectively -74.8 kJ/mol-241.8, kJ/mol, -285.8 kJ/mol, and -393.5 kJ/mol!

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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The fuel in the form of biogas (65%-mol CH4 and 35%-mol CO2) is burned in a furnace. Determine the Low Heating Value (LHV) and High Heating Value (HHV) of the fuel in units of kJ/kmol if the standard forming enthalpy is (DHf,298 K) CH4, H2O(g), H2O(l), and CO2, respectively -74.8 kJ/mol-241.8, kJ/mol, -285.8 kJ/mol, and -393.5 kJ/mol!

Expert Solution
Step 1

Given that,

The mole% of CH4 in the biogas = 65%

The mole% of CO2 in the biogas = 35%

The standard formation enthalpy of CH4 ∆HCH4o = -74.8 kJmol

The standard formation enthalpy of H2O(g) ∆HH2O(g)o = -241.8 kJmol

The standard formation enthalpy of H2O(l) ∆HH2O(l)o = -285.8 kJmol

The standard formation enthalpy of CO2 ∆HCO2o = -393.5 kJmol

It is required to calculate the Low Heating Value (LHV) and High Heating Value (HHV) of the fuel.

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