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钛(Ti)被称为继铁、铝之后的第三金属,已知由金红石(TiO2)制取单质Ti,涉及的步骤为:已知①C(s)+O2(g)CO2(g);ΔH=-393.5kJ·mol-1②2CO(g)+O2(g)2CO2(g);ΔH=-566k

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钛(Ti)被称为继铁、铝之后的第三金属,已知由金红石(TiO 2 )制取单质Ti,涉及的步骤为:

已知①C(s)+O 2 (g) CO 2 (g);

Δ H =-393.5 kJ·mol -1

②     2CO(g)+O 2 (g) 2CO 2 (g);

Δ H =-566 kJ·mol -1

③TiO 2 (s)+2Cl 2 (g)TiCl 4 (s)+O 2 (g);

Δ H =+141 kJ·mol -1

则TiO 2 (s)+2Cl 2 (g)+2C(s) TiCl 4 (s)+2CO(g)的ΔH=          

反应TiCl 4 +2Mg 2MgCl 2 +Ti在Ar气氛中进行的理由是                  

钛(Ti)被称为继铁、铝之后的第三金属,已知由金红石(TiO 2 )制取单质Ti,涉及的步骤为:

已知①C(s)+O 2 (g) CO 2 (g);

Δ H =-393.5 kJ·mol -1

②     2CO(g)+O 2 (g) 2CO 2 (g);

Δ H =-566 kJ·mol -1

③TiO 2 (s)+2Cl 2 (g)TiCl 4 (s)+O 2 (g);

Δ H =+141 kJ·mol -1

则TiO 2 (s)+2Cl 2 (g)+2C(s) TiCl 4 (s)+2CO(g)的ΔH=          

反应TiCl 4 +2Mg 2MgCl 2 +Ti在Ar气氛中进行的理由是                  

2

已知①C(s)+O 2 (g) CO 2 (g);

2 2

Δ H =-393.5 kJ·mol -1

H -1

②     2CO(g)+O 2 (g) 2CO 2 (g);

2 2

Δ H =-566 kJ·mol -1

H -1

③TiO 2 (s)+2Cl 2 (g)TiCl 4 (s)+O 2 (g);

2 2 4 2

Δ H =+141 kJ·mol -1

H -1

则TiO 2 (s)+2Cl 2 (g)+2C(s) TiCl 4 (s)+2CO(g)的ΔH=          

2 2 4          

反应TiCl 4 +2Mg 2MgCl 2 +Ti在Ar气氛中进行的理由是                  

4 2                  
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答案和解析
解析:根据盖斯定律,③+①×2-②,合并后得到反应式TiO 2 (s)+2Cl 2 (g)+ 2C (s) TiCl 4 (s)+2CO(g),则:Δ H =+141 kJ·mol -1 +(-393.5 kJ·mol -1 )×2-(-566 kJ·mol -1 )=-80 kJ·mol -1 。 由于Mg、Ti在...