Question

In: Chemistry

1. Write the chemical equation for the formation of KCl (s) 2. Write the chemical equation...

1. Write the chemical equation for the formation of KCl (s)

2. Write the chemical equation describing the lattice energy for KCl (s)

Expert Solution

KCl --> elements are K and Cl

standard state for K --> K(s)

standard state for Cl --> Cl2(g)

then

K(s) + Cl2(g) --> KCl(s)

balnace

K(s) + 1/2Cl2(g) --> KCl(s)

Q2.

The Lattice energy can be calculated via:

dHf = dHsub + IE + dH(X-X) + EA + U

where U is the value of interest

list:

Heat of formation = (energy required to form element)

Het of atomization = (energy from solid to gas)

Dissociation Energy = (energy required to split X2 to 2X)

Sum of ionization energes = IE1(M)

Sum of Electorn affinites (of the nonmetal, X) = EA(X)

Then

substitute

Lattice energy= Heat of formation- Heat of atomization- Dissociation energy- (sum of Ionization energies)- (sum of Electron Affinities)

dHf = dHsub + IE + dH(X-X) + EA + U

U = dHf - (dHsub + IE(M) + dH(X-X) + EA)

queen_honey_blossom answered 2 years ago

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