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 (hint: should one be negative for the reaction? ) ie ea k: 419 kj/mol 48 kj/mol br: 1140 kj/mol 324 kj/mol

Answer :  The energy change for the reaction is CsCl is, 95 KJ/mole

Explanation :  

The steps involved in the formation of :

(1) Conversion of gaseous potassium atoms into gaseous potassium ions.

= ionization energy of potassium = 419 kJ/mol

(2) Conversion of gaseous bromine atoms into gaseous bromine ions.

= electron affinity energy of bromine = -324 kJ/mol

The overall reaction will be:

To calculate the overall energy change the expression used is:

Now put all the given values in this equation, we get:

Therefore, the energy change for the reaction is CsCl is, 95 KJ/mole

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.