The sublimation energy of
sodium is 108Kj/mole
then standard heat of
atomization of sodium is
______KJ / mole
Answers
Answer:
10. ...................................
Answer:
ΔH
f
0
=ΔH
sub
+IE+ΔH
diss
+EA+U
ΔH
f
0
=108+496+122−349−788=411kJ/mol
The enthalpy change in the formation of an ionic lattice from the gaseous isolated sodium and chloride ions is −788 kJ/mole. That enthalpy change, which corresponds to the reaction Na
(g)
+Cl
(g)
→NaCl
(s)
, is called the lattice energy of the ionic crystal. Although the lattice energy is not directly measurable, there are various ways to estimate it from theoretical considerations and some experimental values. For all known ionic crystals, the lattice energy has a large negative value. It is ultimately the lattice energy of an ionic crystal which is responsible for the formation and stability of ionic crystal structures.
For sodium chloride, the Born - Haber cycle is as shown in the image.
solution