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第 10 章
熱化學
範例 10-3
試求出 C + 2H 2(g) CH 4(g) 在 25℃之反應熱為若干 kcal ?
(s)
已知 C + O 2(g) CO ΔH =- 94.05 kcal
(s)
2(g)
1
H 2(g) + O 2(g) H O ΔH =- 68.32 kcal
(l)
2
2
CH 4(g) + 2O 2(g) CO 2(g) + 2H O ΔH =- 212.80 kcal
(l)
2
解
C + O 2(g) CO 2(g) ΔH =- 94.05 kcal
(s)
2H 2(g) + O 2(g) 2H O (l) ΔH =- 68.32×2 kcal
2
+ ) CO 2(g) + 2H O (1) CH 4(g) + 2O 2(g) ΔH = 212.80 kcal
2
C + 2H 2(g) CH 4(g) ΔH =- 17.89 kcal
(S)
範例 10-4
1 3
已知 NH 3(g) N 2(g) + H ΔH = 11.0 kcal
2(g)
2 2
1
N 2(g) + O 2(g) NO 2(g) ΔH = 8.1 kcal
2
1
H 2(g) + O 2(g) H O ΔH =- 57.8 kcal
2
(g)
2
7 3
求 NH + O NO + H O 之反應熱為若干?
3(g)
4 2(g) 2(g) 2 2 (g)
解
1 3
NH N + H ΔH = 11.0 kcal
3(g)
2 2(g) 2 2(g)
1
2 N 2(g) + O 2(g) NO 2(g) ΔH = 8.1 kcal
3 3 3 3
+ ) 2 H 2(g) + 4 O 2(g) 2 H O (g) ΔH =- 57.8× 2 =- 86.7kcal
2
7 3
NH + O NO + H O ΔH =- 67.6 kcal
3(g)
4 2(g) 2(g) 2 2 (g)
11
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