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

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the average time it took the car to travel 0.50 meters was 2.61 seconds

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