①太阳光催化分解水制氢:2H2O(l)=2H2(g)+ O2(g) ΔH1=+571.6 kJ·mol-1
②焦炭与水反应制氢:C(s)+ H2O(g)=CO(g)+ H2(g) ΔH2=+131.3 kJ·mol-1
③甲烷与水反应制氢:CH4(g)+ H2O(g)=CO(g)+3H2(g) ΔH3=+206.1 kJ·mol-1
A.反应①中电能转化为化学能 |
B.反应②为放热反应 |
C.反应③使用催化剂,ΔH3减小 |
D.反应CH4(g)=C(s)+2H2(g)的ΔH=+74.8 kJ·mol-1 |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2