How to Calculate Ionization Energy for Hydrogen Molecules in KJ/mol

In summary, the conversation discusses a question about calculating the ionization energy of hydrogen in KJ/mol using a given equation. It is determined that the ionization energy per mole is not simply equal to the negative value of the first energy level divided by the number of moles. Instead, the equation E=-2.178E-18(z squared/n squared) is used to find the ionization energy of a single H-atom in Joules, which can then be converted to KJ/mol. The conversation ends with a thank you to Gokul for the help.
  • #1
antiflag403
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PLEASE HELP! Ionization Energy Question

Hello everyone,
I am having some trouble with this question. If one of you could point me in the right direction i would be really grateful.

1. Since the ionization process takes an electron from its ground state to the zero level of the energy scale, the ground state engery calculated for the electron of the hyrdrogen atom can be compared to the negative of its ionization engery. Use the equation E=-2.178E-18(z squared/n squared), for the energy of a valence level n to build an equation that can be used to calculate ionization energy of hydrogen in KJ/mol.

I would assume that the ionization energy per mole would just be equal to the negative value of the first energy level divided by the number of moles but this is wrong.
Any help would be GREATLY appreciated. Thanks
 
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  • #2
Plugging in z=1, n=1, you can find the IE of a single H-atom in Joules. How many H-atoms in a mole ? How many joules in a kilojoule ?
 
  • #3
OK. that makes some sense Gokul. Thanks a lot for the help!
 

1. What is ionization energy?

Ionization energy is the amount of energy required to remove an electron from an atom or molecule, resulting in the formation of a positively charged ion.

2. How is ionization energy measured?

Ionization energy is typically measured in units of kilojoules per mole (kJ/mol) or electron volts (eV).

3. What factors affect ionization energy?

The main factors that affect ionization energy include the number of protons in the nucleus, the distance between the nucleus and the outermost electron, and the shielding effect of inner electrons.

4. Why does ionization energy increase across a period in the periodic table?

In a period, the number of protons in the nucleus increases, resulting in a stronger attraction between the nucleus and the outermost electron. This makes it more difficult to remove an electron, thus increasing the ionization energy.

5. What is the relationship between ionization energy and reactivity?

Generally, elements with low ionization energies are more reactive because they are more likely to lose electrons and form positive ions. Conversely, elements with high ionization energies tend to be less reactive because they are less likely to lose electrons.

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