examples 4.7 and 4.8

examples 4.7 and 4.8 - Example 4.7 What is the maximum...

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Unformatted text preview: Example 4.7: What is the maximum temperature that can be reached by the combustion of methane with 20% excess air? Both the methane and the air enter the burner at 25°C. ) ( 2 ) ( 2 ) ( 2 ) ( 4 2 2 g g g g O H CO O CH + → + If Ws= 0, kinetic- and potential energy changes are negligible, adiabatic process at constant pressure, Q=ΔH = 0 Reactants at 1 bar and 25°C 1 mol CH 4 2.4 mol O 2 9.03 mol N 2 [=2.4(79/21)] Products at 1 bar and T K 1 mol CO 2 2 mol H 2 O 0.4 mol O 2 9.03 mol N 2 ΔH = 0 K H 298 ∆ ∑- = ∆ i H o Pi i P T C n H ) 15 . 298 ( Products at 1 bar and 25 o C 1 mol CO 2 2 mol H 2 O 0.4 mol O 2 9.03 mol N 2 For air, O2 : N2 = 21 : 79 1 mole methane needs 2 mole O 2 20% excess of O2 = 0.4 mole Total N2 = 2.4 (79/21) = 9.03 mole J H K 802625 ) 74520 ( ) 241818 )( 2 ( 393509 298- =--- +- = ∆ H P C H T 298 15 . 298 ∆- = ) 15 . 298 ( , 298 298 =- + ∆ = ∆ + ∆ = ∆ ∑ i H o i P i o o P o T C n H H H H...
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examples 4.7 and 4.8 - Example 4.7 What is the maximum...

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