# Problem: Calculate the energy change for the reactionK(g) + Br(g) → K+(g) + Br– (g)given the following ionization energy (IE) and electron affinity (EA) valuesIE                                     EAK:   419 kJ/mol               48 kJ/molBr: 1140 kJ/mol              324 kJ/molA)     –1,092 kJ/mol                     D)      1,092 kJ/moB)     –95 kJ/mol                          E)      95 kJ/molC)      1,187 kJ/mol

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###### FREE Expert Solution

We’re being asked to calculate the energy change (ΔE) for the given reaction given their respective ionization energies and electron affinities.

To calculate for the change in energy, we're going to use the following equation:

Recall:

Ionization energy is the energy required to remove an electron from a gaseous atom or ion.

Electron affinity is the energy required to add 1 mole of electrons to a gaseous element.

IE                                EA

K:        419 kJ/mol                 48 kJ/mol

Br:      1140 kJ/mol               324 kJ/mol ###### Problem Details

Calculate the energy change for the reaction

K(g) + Br(g) → K+(g) + Br (g)

given the following ionization energy (IE) and electron affinity (EA) values

IE                                     EA

K:   419 kJ/mol               48 kJ/mol

Br: 1140 kJ/mol              324 kJ/mol

A)     –1,092 kJ/mol                     D)      1,092 kJ/mo

B)     –95 kJ/mol                          E)      95 kJ/mol

C)      1,187 kJ/mol

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Periodic Trends concept. If you need more Periodic Trends practice, you can also practice Periodic Trends practice problems.

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What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Pinet's class at Stetson University.