3.已知:Mg(s)的昇華熱為148kJ/mol;Mg(g)形成(g)的游離能為2187kJ/mol;Br2(l)的汽化熱為31kJ/mol;Br2(g)的鍵能為193kJ/mol;Br(g)形成(g)的電子親和力為-331kJ/mol;MgBr2(s)的莫耳生成熱為-524kJ/mol;(g)的水合能為-390kJ/mol;(g)的水合能為-80kJ/mol。試求出MgBr2(s)的晶格能為_____kJ/mol?