Monday, September 06, 2010

Electronic Terms

Boltzmann Constant:

In joules equals  1.3806503 × 10-23 (m2 kg s-2 K-1  ) or joules per kelvin

In electronvolts, the Boltzmann constant is 8.617 343(15) × 10−5 eV/K

Used to define the relation between absolute temperature and the kinetic energy contained in each molecule of an ideal gas, a constant of proportionality for temperature and energy

Avogadro's Number:

The number of atoms needed such that the number of grams of a substance equals the atomic mass of the substance,

An Avogadro's number of substance is called a mole. For example, a mole of carbon-12 atoms is 12 grams, a mole of hydrogen atoms is 1 gram, a mole of hydrogen molecules is 2 grams, etc.

Faraday's constant:
It is the charge carried by one mole of electrons. There are 6.02214e23 electrons per mole of electrons. (Avogadro's number)
Each electron has a charge of 1.602177e-19 coulombs per electron.
So Faraday's constant is 1.602177e-19 coulombs per electron * 6.02214e23 electrons per mole of electrons = 9.64853e4 coulombs / mole of electrons.
This constant is useful to us when we are doing problems in electrolysis.

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