相關H2F2g的文學知識

問題詳情：已知*化*氣體中有平衡關係：①2H3F3(g)===3H2F2(g)ΔH1＝akJ·mol－1②H2F2(g)===2HF(g)ΔH2＝bkJ·mol－1已知a、b均大於0，則可推測反應：H3F3(g)===3HF(g)的ΔH3＝()A．(a＋b)kJ·mol－1            B．(a－b)kJ·mol－1C．(...