离子键强度与晶格能: 晶格能(U)( Lattice Enthalpies) 定义:晶格能表示相互远离的气态正离子和负离子结 合成1mo离子晶体时所释放的能量,或1mo离子晶 体解离成自由气态离子时所吸收的能量。( A measure of the attraction between ions is lattice enthalpy, the enthalpy change per mol of formula units when a solid is broken up to a gas of widely separated ions. (取其绝对值)如: Cal(g)+ 2cI(g)e Cacl2(s) △H=U=2260kJ/mol离子键强度与晶格能： • 定义：晶格能表示相互远离的气态正离子和负离子结 合成 1 mol 离子晶体时所释放的能量，或1 mol 离子晶 体解离成自由气态离子时所吸收的能量。（A measure of the attraction between ions is lattice enthalpy, the enthalpy change per mol of formula units when a solid is broken up to a gas of widely separated ions.） （取其绝对值）如： Ca2+ (g) + 2Cl- (g) CaCl2 (s) – H = U = 2260.kJ/mol 晶格能（U） (Lattice Enthalpies) ⎯⎯⎯⎯→