Calculate the energy change in kilojoules per mole when lithium atoms lose an electron to bromine atoms to form isolated Li+ and Br-ions. [The Ei for Li1g2 is 520 kJ/mol; the Eea for Br1g2 is -325 kJ/mol.] Will a lithium atom transfer an elec-tron to a bromine atom to form isolated Li+ 1g2 and Br-1g2 ions? Explain.

Video transcript

Hello everyone today. We have the following question, calculate the change in entropy when sodium atoms lose an electron to chlorine atoms and form sodium plus and chloride ions is the reaction favorable. So first we need to find the ionization energy for sodium. So we need the ionization energy for our sodium and our electron affinity for chlorine. So for our sodium Organization energy is going to involve losing an electron. So we're gonna show that with our sodium on the left side and arrow followed by sodium plus plus an electron here. And if you have a reference text that is going to be equal to 495 0. killed joules per mole for the electron affinity for chlorine, that's going to be chlorine. Gaining an electron affinity means liking something so lacking electrons. And that's going to transform this chlorine into chloride. And that electron affinity is going to be equal to negative 348.57 kg joules per mole. And once again these values are in a reference textbook. Next you are simply going to add the ionization energy for sulfur and the electron affinity for chlorine. When we do that, we're going to get the change in entropy being equal to our 495.85 Kill em all plus Our negative 48 .57 kg per mole. And this is going to result in 147.28 kg joules per mole. So that is the change in the entropy. Now we have to find out if it is favorable. Well, when our change in entropy here is greater than zero, the reaction is going to be unfavorable. So this reaction is unfavorable. And what does it mean to be unfavorable? Well the change in entropy is essentially just the change in the heat energy. And so this is saying that we are gaining heat energy. So it's going to be unfavorable to gain the energy rather than lose it because that's the natural process. And with that we've answered the question overall, I hope this helped. And until next time.