Gly (s) + O₂(g) → 2 CO₂ (g) +
H₂O(l) + ≤ N₂ (g)
Cp, m² (Gly, s) = 99,2 J K "mal", Cp,m (0₂₁ 8) = 29.355 JK "mol", Cp.m² (CO₂, g) = 37.11JKing ¹
m³ (H₂0₁ l) = 75.291 JK"mol, Cp, m ² (N₂, g) = 29.125 J K "mal"
ArH=-973 kJ mol' (298K)
Cpm
Arcp = vCpim²(生成物)-vCp,me(反応物)を計算し、キルヒホフの法則
Aripe(T) = ArH(T)-(T'-T)Arcpに代入する。
ArCp² = {2Cp, m² (CO₂, g) + { Cp, m³ (H₂0₁ l) + — Cp,m²* (N₂,g) } - { Cp,m² (Gly, s) to Cp, m² (0₂,8)
= { 2x (31₁ | JK"mol-¹) + X (75, 3 J K " mol"!) + = x (29,1 JK" mol¯')}
{(99,2 J K´mol¯') + & × (29,4 JK"mol"')
X
= {(14.2 JK¯mol-¹) + (188, 25 J K " mol-') + (14,55 J K¯'mel¯') }
-{(99,2 J K ¹ mol "¹ ) + (66.15 JK"mel '')}
= (277 JK¯'mol¹)- (165, 35 JK-mol)
=+111.65 JK 'mal? = + 111. 65 × 10³ kJK"mol = 1.12 × 10¹ KJK" mel
Arte (340 k) = (-973 kJ mol −¹ ) + ( + 1,12 × 10-¹ KJK" mol ¹) × (4²K)
= (-9.73kJmol ¹) + ( + 4. 704 kJ mol)
= - 968 296 kJmol + = -968,3 kJmol"!
