完成下列填空:把煤作為燃料可通過下列兩種途徑:
途徑Ⅰ:C(s)+O
2(g)═CO
2(g)△H
1<0①
途徑Ⅱ先制成水煤氣:C(s)+H
2O(g)═CO(g)+H
2(g)△H
2>0②
再燃燒水煤氣:2CO(g)+O
2(g)═2CO
2(g)△H
3<0③
2H
2(g)+O
2(g)═2H
2O(g)△H
4<0④
請回答下列問題:
(1)途徑Ⅰ放出的熱量理論上
(填“大于”、“等于”或“小于”)途徑Ⅱ放出的熱量.
(2)△H
1、△H
2、△H
3、△H
4的數(shù)學關系式是
.
(3)已知:
①C(s)+O
2(g)═CO
2(g)△H
1=-393.5kJ?mol
-1②2CO(g)+O
2(g)═2CO
2(g)△H
2=-566kJ?mol
-1③TiO
2(s)+2Cl
2(g)═TiCl
4(s)+O
2(g)△H
3=141kJ?mol
-1則TiO
2(s)+2Cl
2(g)+2C(s)═TiCl
4(s)+2CO(g)的△H=
.