2. 請由以下反應及反應熱計算出 LiF(s)的格子能 (lattice energy) Li(s)的昇華熱 (sublimation energy) +166 kJ/molF2(g)的鍵能 (bond energy) +154 kJ/mol  Li(g)的第一游離能 (first ionization energy) +520 kJ/mol F(g)的電子親和能 (electron affinity)–328 kJ/mol  LiF(s)的生成熱 (enthalpy of formation)–617 kJ/mol 
(A) 285 kJ/mol
(B) –650 kJ/mol
(C) 800 kJ/mol
(D) –1052 kJ/mol