In joules equals

**1.3806503 × 10**

^{-23}(m^{2}kg s^{-2}K^{-1 }**) or joules per kelvin**

**In electronvolts, the Boltzmann constant is**

**8.617 343(15) × 10**^{−5}**eV/K**

^{Symbol: }^{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}

^{http://en.wikipedia.org/wiki/Boltzmann_constant}

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^{Avogadro's Number:}

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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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