1. (a) Calculate the value of AG for the reaction below at 800 K. (b) What percent error occurs if it is assumed that AC, for the reaction is zero? Some useful data: Substance Si3N4 (s) + 30₂ (g) = 3SiO₂ (a/quartz) + 2 N₂ (g) Si3N4 (s) O₂ (g) SiO₂ (a/quartz) N₂ (g) Cp (J/mole x K) 70.54 +98.74 x10-³ T (298-900 K) 29.96 + 4.18 x10-³ T-1.67 ×105 T-² (298-3000 K) 43.89 +1.00×10-³ T-6.02 ×105 T-² (298-847 K) 27.87 + 4.27 x10-³ T (298-2500 K) ΔΗ°f, 298 K (J/mole) -744,800 -910,900 --- Sº, 298 K (J/molexK) 113.0 205.1 41.5 191.5
1. (a) Calculate the value of AG for the reaction below at 800 K. (b) What percent error occurs if it is assumed that AC, for the reaction is zero? Some useful data: Substance Si3N4 (s) + 30₂ (g) = 3SiO₂ (a/quartz) + 2 N₂ (g) Si3N4 (s) O₂ (g) SiO₂ (a/quartz) N₂ (g) Cp (J/mole x K) 70.54 +98.74 x10-³ T (298-900 K) 29.96 + 4.18 x10-³ T-1.67 ×105 T-² (298-3000 K) 43.89 +1.00×10-³ T-6.02 ×105 T-² (298-847 K) 27.87 + 4.27 x10-³ T (298-2500 K) ΔΗ°f, 298 K (J/mole) -744,800 -910,900 --- Sº, 298 K (J/molexK) 113.0 205.1 41.5 191.5
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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Transcribed Image Text:1.
(a) Calculate the value of AG for the reaction below at 800 K.
(b) What percent error occurs if it is assumed that ACp for the reaction is zero?
Some useful data:
Substance
Si3N4 (s) + 302 (g) = 3SiO₂ (a/quartz) + 2 N₂ (g)
Si3N4 (s)
O₂ (g)
SiO₂ (a/quartz)
N₂ (g)
Cp (J/mole x K)
70.54 +98.74 ×10-³ T (298-900 K)
29.96 + 4.18 ×10−³ T − 1.67 ×105 T-² (298-3000 K)
43.89 +1.00 ×10-³ T - 6.02 ×105 T−² (298-847 K)
27.87 + 4.27 ×10-³ T (298-2500 K)
ΔΗ°f, 298 Κ
(J/mole)
-744,800
-910,900
Sº, 298 K
(J/molexk)
113.0
205.1
41.5
191.5
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