Homework Help: Chemistry

Posted by Rob on Saturday, December 8, 2012 at 8:30pm.

Use the data given below to construct a Born - Haber cycle to determine the electron affinity of Br?
DH°(kJ)
K(s) → K(g) 89
K(g) → K⁺(g) + e⁻ 419
Br2(l) → 2 Br(g) 193
K(s) + 1/2 Br2(g) → KBr (s) -394
KBr(s) → K⁺(g) + Br⁻(g) 674

I know the answer is -325 kj, I want to know how to get it. Thanks

Chemistry - DrBob222, Saturday, December 8, 2012 at 9:08pm
sub = sublimation
ip =- ionization potential
DE = dissociation energy
EA = electron affinity
Hf = heat formation
Ecrystal = reverse last equation
dHf = dHsub + ip + 1/2(DE) + EA + Ecryst
-394 = 89+419+96.5+EA-674
Solve for EA.

Answer this Question

Related Questions

chemistry - use the data given below to construct a Born-Haber cycle to ...
Chemistry - What is the enthalpy change (in kJ/mol) for the following process? ...
Chemistry*Dr.Bob - I keep finding all sorts of different enthalpy of ...
AP Chemistry Born-Haber Cycle? - When using the Born-Haber Cycle for Na2S, do I ...
Chemistry - Consider an ionic compound, MX2, composed of generic metal M and ...
Chemistry - How do I draw a Born-Haber Cycle for diphosphorous pentasulfide? ...
chemistry - Data given are related to the Born-Haber cycle for HCl Calculate the...
Chemistry - Consider the gas-phase transfer of an electron from a sodium atom to...
Chemistry - What's the relationship between ionization energy and electron ...
Chemistry - Draw a diagram of the Born-Haber cycle for potassium bromide. ...

For Further Reading

First Name:
School Subject:
Answer: