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2Hg(l)＋O2(g) = 2HgO(s) ΔH=-181.6 kJ·mol-1
则反应2Zn(s)＋2HgO(s)=2ZnO(s)＋2Hg(l)的ΔH为
| A．＋519.4 kJ·mol-1 | B．-259.7 kJ·mol-1 | C．＋259.7 kJ·mol-1 | D．-519.4 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
