Answer:
379.94
Explanation :
check out my attached work
Hope it helps, let me know if you have any questions !
Have a nice rest of your day :)
As the given values are
<span>ΔHf° = –423 kJ/mol
</span>ΔHsub = 119 kJ/mol
IE = 469 kJ/mol
ΔHEA = –301 kJ/mol
BE = 161 kJ/mol
The lattice energy of the compound can be determined by applying formula
U = <span>ΔHf° - </span>ΔHsub - BE - IE - ΔHEA
by putting values
U = -423 - 119 - 161 - 469 - (-301)
solving further
U = -871 kJ/mol
so the lattice energy is 871 kJ/mol
hope it helps
Postulate: given segment AC the point B belongs to this segment if and only if segment AB + segment BC = segment AC.
Then you can use a stick and call A and Cits edges, the mark an intermediate point, i.e. between A and C, on the segment and verify that you can measure each segment AB, BC and AC ant the postulate is satisfied.