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Which compound has the most and least negative energy and which compound has a higher melting point?

Which compound has the most negative energy of ion pair formation Which has the least negative value?
a) NaCl
b) MgS
c) MgF2
Which compound in each of the following pairs should have the higher melting point?
a) NaCl or RbCl
b) BaO or MgO
c) NaCl or Mgs

3 COMMENTS

  1. whitecar77, the enthalpy of formation of the three salts are
    a) NaCl ∆Hf -411.1 kJ/mol
    b) MgS ∆Hf -601.24 kJ/mol
    c) MgF2 ∆Hf -1124.2 kJ/mol
    So NaCl has the lowest energy released from the formation sodium and chlorine
    Melting points
    NaCl = 801 °C
    RbCl = 718 °C
    BaO = 1923 °C
    MgO = 2852 °C
    MgS = >2000 °C

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