Problems: els
1. Calculate the lattice energy of KCl using following data
Enthalpy of sublimation of K = 91 KJmol-1
Enthalpy of dissociation of Cl2 = 121.5 Kmol-1
lonization energy of K = 419 Kjmol
Electron affinity of Cl = -349 KJmol-1
Enthalpy of formation of KC) = -440 KJmol-1
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The force of attraction among covalent molecules are weak therefore the covalent compounds are gases or liquids at room temperature they have low melting points and low boiling points based on the principle they have low melting points and low boiling point based on the principle that I like dissolves in like these covalent compounds are soluble in polar solvent because the non polar nature of covalent molecules in the the chemical reaction to covalent compound the success bounding breaking and bound from forming to get products this force this therefore these reactions are moderating or very slow
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