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The diagram below shows the energy changes that occur when sodium chloride dissolves in water. Study it and answer the questions that follow.
sukchempp1q05

  1. What do ∆H1, ∆H2 and ∆H3 represent? 
  2. Given that the lattice energy of NaCl (s) is -776 kJmol-1 and hydration energies of Na+(g) and Cl-(g) are -407 kJmol-1 and -364 kJmol-1 respectively. Calculate the heat of solution (∆Hsol) of 1 mole NaCl (s). 

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  1.   
    • ∆H1 : Lattice energy
    • ∆H2 : Hydration energy
    • ∆H3 :Heat of solution
  2.    
    • (∆Hsol) = ∆H1 + ∆H2
      = 776 + (-407-364) = + 5 kJmol-1
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