(1)甲烷是一種高效清潔的新能源,0.25mol甲烷完全燃燒生成液態(tài)水時,放出222.5kJ熱量,則甲烷燃燒熱的熱化學(xué)方為
CH4(g)+2O2(g)→CO2(g)+2H2O(l)△H=-890KJ/mol
CH4(g)+2O2(g)→CO2(g)+2H2O(l)△H=-890KJ/mol
.
(2)已知:Fe(s)+1/2O
2(g)=FeO(s)△H=-270.0kJ/mol,2Al(s)+3/2O
2(g)=Al
2O
3(s)△H=-1675.7kJ/mol,Al和FeO發(fā)生鋁熱反應(yīng)的熱化學(xué)方程式是
2Al(s)+3FeO(s)═Al2O3(s)+3Fe(s)△H=-865.7 kJ?mol-1
2Al(s)+3FeO(s)═Al2O3(s)+3Fe(s)△H=-865.7 kJ?mol-1
.
(3)①反應(yīng)的分類研究:從能量變化角度分,將反應(yīng)分為放熱反應(yīng)和吸熱反應(yīng).下列反應(yīng)中能量變化符合如圖所示的是
BC
BC
(填序號)
A.鐵片與稀鹽酸反應(yīng)
B.灼熱的碳與CO
2反應(yīng)
C.Ba(OH)
2?8H
2O與NH
4Cl反應(yīng)
D.甲烷在氧氣中的燃燒反應(yīng)
②煤作為燃料有兩種途徑:
Ⅰ、C(s)+O
2(g)═CO
2(g)△H
1<0Ⅱ.C(s)+H
2O(g)═CO(g)+H
2(g)△H
2>0
2CO(g)+O
2(g)═2CO
2(g)△H
3<0 2H
2(g)+O
2(g)═2H
2O(g)△H4<0
請回答:途徑Ⅰ放出的熱量
=
=
途徑Ⅱ放出的熱量(填“>”、“<”或“=”).
△H
1、△H
2、△H
3、△H
4之間關(guān)系的數(shù)學(xué)表達式是
.