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Borne Haber Cycle/ Lattice Enthalpy for KBr

by dav1d
Tags: borne, cycle or, enthalpy, haber, lattice
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dav1d
#1
Nov6-11, 08:58 AM
P: 65
1. The problem statement, all variables and given/known data

Draw the Borne Haber cycle for KBr

2. Relevant equations



3. The attempt at a solution

so the energy required to make the K into gas is +89kJ/mol
and it takes +420kJ/mol to take 1 electron from K

it takes +112kJ/mol to make Br a gas
it takes -342kJ/mol to give the Br an electron

and i was given -392 delta H subscrpit F superscript theta = -392kJ/mol (what does this mean?)

how do i calculate the lattice enthalpy?

Using Hess's law it should be the sum
So is it
89+420+112-342-392???
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