利用盖斯定律解答下列各小题(1)已知反应:H2(g)+12O2(g)═H2O(g)△H1N2(g)+2O2═2NO2(g)△H2

2025-04-03 10:37:18
推荐回答(1个)
回答1:

(1)①H2(g)+

1
2
O2(g)═H2O(g)△H1
②N2(g)+2O2═2NO2(g)△H2
1
2
N2(g)+
3
2
H2(g)═NH3(g)△H3
利用上述三个反应,结合盖斯定律计算①×6+2×②-4×③得到:4NH3(g)+7O2(g)═4NO2(g)+6H2O(g)的反应焓变为6△H1+2△H2-4△H3
故答案为:6△H1+2△H2-4△H3
(2)①CH4(g)+H2O(g)═CO(g)+3H2(g)△H=+206.2kJ?mol-1
②CH4(g)+CO2(g)═2CO(g)+2H2(g)△H=+247.4kJ?mol-1
结合盖斯定律①×2-②得到CH4(g)与H2O(g)反应生成CO2(g)和H2(g)的热化学方程式为:CH4(g)+2H2O(g)═CO2(g)+4H2(g)△H=+165.0 kJ?mol-1
故答案为:CH4(g)+2H2O(g)═CO2(g)+4H2(g)△H=+165.0 kJ?mol-1