We’re asked to **determine the first ionization energy (in kJ/mol) of mercury, Hg, **given the **kinetic energy of the emitted electron** and **wavelength during PES**.

Recall that the **ionization energy **corresponds to the energy needed to * remove an electron*, it is the

This means that we can solve for the **first ionization energy**, using the equation:

$\overline{){\mathbf{I}}{\mathbf{.}}{\mathbf{E}}{\mathbf{.}}{\mathbf{=}}{{\mathbf{E}}}_{{\mathbf{photon}}}{\mathbf{-}}{\mathbf{K}}{\mathbf{.}}{\mathbf{E}}{{\mathbf{.}}}_{{\mathbf{electron}}}}$

Also recall that the **energy, E of a photon,** is given by the equation:

$\overline{){\mathbf{E}}{\mathbf{=}}{\mathbf{h\nu}}}$

E_{total energy} = J

h = Planck’s constant = 6.626x10^{-34} J∙s

ν = frequency = Hz or s^{-1}

One way to measure ionization energies is photoelectron spectroscopy (PES), a technique based on the photoelectric effect. In PES, monochromatic light is directed onto a sample, causing electrons to be emitted. The kinetic energy of the emitted electrons is measured. The difference between the energy of the photons and the kinetic energy of the electrons corresponds to the energy needed to remove the electrons (that is, the ionization energy). Suppose that a PES experiment is performed in which mercury vapor is irradiated with ultraviolet light of wavelength 58.4 nm.

The kinetic energy of the emitted electrons is measured to be 10.75 eV. What is the first ionization energy of Hg, in kJ/mol?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Periodic Trend: Ionization Energy concept. You can view video lessons to learn Periodic Trend: Ionization Energy. Or if you need more Periodic Trend: Ionization Energy practice, you can also practice Periodic Trend: Ionization Energy practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Ratliff's class at USF.