搜索
| 共价键 | H- H | H-O |
| 键能/(kJ·mol-1) | 436 | 463 |
| 热化学方程式 | 2H2(g) + O2 (g)=2H2O(g) ΔH= -482kJ·mol-1 | |
| A．428 kJ·mol-1 | B．-428 kJ·mol-1 | C．498 kJ·mol-1 | D．-498 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
