aCl/生成的Born- Heber cycle Na(g)+Cl(g)+e 6△H3=+4966AH4=-34k Nat(g)+ CIig Na(g)+ Cl(g) Na(g)+1 C1,(g) △H2,=+122kJ Na(s)+C1(g) AH1=+107kJ 6 △H=-787kJ START △ HaNa(s)]=-4lk Nacl(s ENDNaCl(s)生成的Born-Heber cycle