加热\(\rm{MnCO_{3}}\)会同时发生如下三个反应：
序号 | 反应 | \(\rm{\triangle }\)\(\rm{H}\) \(\rm{(kJ·mol^{-1})}\) | \(\rm{K}\) |
\(\rm{300℃}\) | \(\rm{800℃}\) |
\(\rm{I}\) | \(\rm{MnCO_{3}(s)+1/2O_{2}(g)}\) \(\rm{⇌ }\) \(\rm{MnO_{2}(s)+CO_{2}(g)}\) | \(\rm{a}\) | \(\rm{3.0×10^{7}}\) | \(\rm{1.8×10^{5}}\) |
\(\rm{II}\) | \(\rm{MnCO_{3}(s)+1/4O_{2}(g)⇌ 1/2Mn_{2}O_{3}(s)+CO_{2}(g)}\) | \(\rm{b}\) | \(\rm{1.7×10^{3}}\) | \(\rm{2.4×10^{5}}\) |
Ⅲ | \(\rm{MnCO_{3}(s)+1/6O_{2}(g)⇌ }\) \(\rm{1/3Mn_{3}O_{4}(s)+CO_{2}(g)}\) | \(\rm{c}\) | \(\rm{9.8}\) | \(\rm{9.6×10^{4}}\) |
\(\rm{①a}\) \(\rm{0(}\)填“\(\rm{ > }\)”、“\(\rm{=}\)”或“\(\rm{ < }\)”\(\rm{)}\)。
\(\rm{②}\)已知：\(\rm{2CO(g) + O_{2}(g)= 2CO_{2}(g)}\) \(\rm{\triangle }\)\(\rm{H}\)\(\rm{=d}\) \(\rm{kJ·mol^{-1}}\)，则：\(\rm{3MnO_{2}+ 2CO(g)⇌ }\) \(\rm{Mn_{3}O_{4}(s) + 2CO_{2}(g)_{\;\;}}\)的\(\rm{\triangle }\)\(\rm{H}\)\(\rm{=}\) 。
\(\rm{③}\)在\(\rm{300℃}\)条件下加热\(\rm{MnCO_{3}}\)制取\(\rm{Mn_{3}O_{4}}\)并不合适，理由是： ．\(\rm{800℃}\)时，\(\rm{Mn_{2}O_{3}(s) + 1/2O_{2}(g)⇌ }\) \(\rm{2 MnO_{2}(s)}\) 的平衡常数\(\rm{K}\)值为 ．