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Calculate the change in energy for the following processes:(a) $\operatorname{Mg}(g)+2 \mathrm{F}(g) \longrightarrow \mathrm{Mg}^{2+}(g)+2 \mathrm{F}^{-}(g)$(b) $2 \mathrm{Al}(g)+3 \mathrm{O}(g) \longrightarrow 2 \mathrm{Al}^{3+}(g)+3 \mathrm{O}^{2-}(g)$The electron affinity of $\mathrm{O}^{-}$ is $-844 \mathrm{kJ} / \mathrm{mol}$

a. $1532.1 \mathrm{kJ} / \mathrm{mol}$b. $12404.8 \mathrm{kJ} / \mathrm{mol}$

Chemistry 101

Chapter 8

Periodic Relationships Among the Elements

Periodic Table properties

Drexel University

University of Maryland - University College

University of Kentucky

Lectures

03:33

In chemistry and physics, a periodic table or periodic chart is a tabular arrangement of the chemical elements, ordered by their atomic number, electron configurations, and recurring chemical properties. Elements are presented in order of increasing atomic number ("column") and periodic properties, such as symbol, name, atomic mass and group (period) number are listed for each element. The periodic table can be used to derive relationships between the various properties of the elements, and predict the properties of new elements yet to be discovered or synthesized.

08:45

The periodic table is a tabular display of the chemical elements, organized on the basis of their atomic numbers, electron configurations, and recurring chemical properties. The table can be used to derive relationships between the properties of the elements, and predict the properties of new elements yet to be discovered or synthesized. The periodic table can be used to summarize chemical behavior, and it is widely used in chemistry and other sciences as a tool to determine the chemistry of new substances.

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So in this podcast, we're determining the energy change that is associated with the following chemical equations. So we've got MG at F two is in equilibrium with M g two plus two f minus fast ionization energy of M G is 3738.1 kg Jewels pummel the energy required to remove an electron from magnesium is 738.1 kg jewels Permal So our second ionization energy here is 1450 So the energy required to remove the second electron is 1450 the election affinity off a flooring atom is plus 3 to 8. And so the energy released one on electron is ad Is it added is negative 3 to 3 key to Jules Pirmin. So we have to florian atoms. So we double that number. So are changing energy. Is the energy released at the energy absorbed? We add the figures above that we defined on We get a total number off 1532.1 kg. Permal. So now we just have one more example and I've performed a very simple calculation where we have to a l at 30 is in equilibrium with two l three plus on three to minus. So our first ionization energy, we multiplied by two to get a figure of 1155.8 our second ionization energy of Allah menu. Again, we multiplied by two to get 3640 On our third figure, we again multiplied by two to get a number of 5500 Key to Jules Permal by the electron affinity of oxygen is plus one for 1 kg Jewels, Permal. And so the energy the energy released when electron is added to oxygen is negative one for 1 kg joules per mole. So we have three oxygen asked him. So we multiply the above by three. So we do the exact same for oxygen. And so the change in energy is the energy released at the energy absorbed. We add all the numbers that we determined above to get changing energy off 12404.8 kg per mole

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