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| A．2H2+O2=2H2O ΔH=142.9kJ·mol-1 |
| B．2H2(g)+O2(g)=2H2O(l) ΔH=-142.9kJ·mol-1 |
| C．2H2(g)+O2(g)=2H2O(l) ΔH=-571.6kJ·mol-1 |
| D．2H2(g)+O2(g)=2H2O(l) ΔH=+571.6kJ·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
