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# 實驗六 反應熱的測定 - PowerPoint PPT Presentation

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## 實驗六 反應熱的測定

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### 實驗六反應熱的測定

(一) 反應熱的測定 化學反應通常伴隨著能量的改變，如果反

(heat of formation)，以ΔH表示。若將反應在

T1：卡計與 x mL 冷水達到平衡的溫度

T2：y mL 熱水的溫度

Tf：冷水與熱水混合後的平衡溫度

H1：熱水放出的熱量

= (T2 – Tf)ºC · y mL · 1 g/mL · 1 cal/g·ºC

H2：冷水吸收的熱量

= (Tf – T1)ºC · x mL · 1 g/mL · 1 cal/g·ºC

H3：卡計吸收的熱量

= (Tf – T1)ºC · 卡計熱容量 cal/g·ºC

H1 = H2 + H3

ΔH = ΔT · (卡計的熱容量 + 內容物的熱容量)

(二) 黑斯定律之應用－氧化鎂之莫耳生成熱

kcal/mol ) 及黑斯定律，可求得氧化鎂的莫耳

Mg(s) + 2H+(aq)Mg2+(aq) + H2(g)ΔH1 (6-1)

MgO(s) + 2H+(aq) Mg2+(aq) + H2O(l) ΔH2 (6-2)

H2(g) + ½O2(g) H2O(l)ΔHf0(H2O) (6-3)

Mg(s) + ½O2(g) MgO(s)ΔHf0(MgO) (6-4)

• 保利龍杯 (250 mL、2個)
• 杯蓋 (1個)
• 電子數字型溫度計
• 燒杯 (400 mL)
• 量筒 (100 mL)

• 1.0 M 氫氧化鈉 ( NaOH )
• 1.0 M 鹽酸 ( HCl )
• 1.0 M 醋酸 ( CH3COOH )
• 0.2 M 硫酸銅 ( CuSO4 )
• 硝酸銨 ( NH4NO3 )
• 鋅粉 ( Zn )
• 氧化鎂 ( MgO )
• 鎂片 ( Mg )

• 鎂片與鹽酸反應時會產生氫氣，操作時

• 實驗後反應之廢液請倒入特定廢液回收