Question

What is the magnitude of the energy of a bond formed between a potassium (K+) cation and an iodide (I−) anion? The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10. Please report your answer in joules.

Answer 1

use the borne-lande equation

Answer 2

i used but i can not found answer

Answer 3

who knows answer

Answer 4

in borne-lande equation what the value of distance between ions

Answer 5

add up the radii

Answer 6

i used this formula BE= (Z*e^2/4*pi*epsilon_0*r0)*(1-1/n) but i can not find answer.

Answer 7

can you solve it

Answer 8

Magnesia (MgO) is a very stable ionic solid commonly used as an inert containment vessel in high temperature experiments. The Born exponent, n, is 5.6 for MgO and its Madelung constant is 1.75. The ionic radii of Mg2+ and O2− are 48 and 145 pm, respectively.

(a) Calculate the dissociation energy of a single MgO ion pair in the gaseous state. Express your answer in units of electron volts (eV) per ion pair.(b) Calculate the cohesive energy of an MgO crystal. Express your answer in units of kJ/mol.
can you solve this please

Answer 9

post what you did and i'll check it

Answer 10

E=(1.602*10^-19)^2*+1*(-1)*6.023*10^23/4*31.4*8.85*10^-12*358*10^-12*(1-1/10) IN EQUATION WHERE IS THE WRONG STATEMENT

Answer 11

\(E=\dfrac{(1.602*10^{-19})^2*(6.023*10^{23})M}{4\pi*(8.85*10^{-12})*(358*10^{-12})}(1-\dfrac{1}{10}) \)

this reduces to:

\(E=349362.16 *M~J/mol~\)

but you need to know the madelung constant, M, i looked around but couldnt find it.

Answer 12

thanks

Answer 13

no problem

Answer 14

What is the value of M in this sisuation

Answer 15

Anybody got the answer?