3H2F2的精选

问题详情：已知*化*气体中有平衡系： ①2H3F3(g)＝ 3H2F2 (g) Δ H 1 ＝ a kJ·mol － 1  ②H2F2(g) ＝2HF(g) Δ H 2＝ b kJ·mol － 1 已知 a 、 b 均大于 0 ，则可推测反应： H3F3 (g)＝ 3HF(g) 的 Δ...

问题详情：已知*化*气体中有平衡关系：①2H3F3(g)===3H2F2(g)ΔH1＝akJ·mol－1②H2F2(g)===2HF(g)ΔH2＝bkJ·mol－1已知a、b均大于0，则可推测反应：H3F3(g)===3HF(g)的ΔH3＝()A．(a＋b)kJ·mol－1            B．(a－b)kJ·mol－1C．(...