7/28/2019 Faraday Constant - Wikipedia, The Free Encyclopedia

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araday constantm Wikipedia, the free encyclopedia

physics and chemistry, the Faraday constant (named after Michael Faraday) is the magnitude of electric charge per mole of electrons.[1] It has the currently accepted value

9.64853399(24) x 104 C mol-1

e constant Fhas a simple relation to two other physical constants:

ere:

e 1.602 1766 1019 C;[2]

NA

6.022 141 10

23

mol

1

.

[3]

is the Avogadro constant (the ratio of the number of particles 'N' to the amount of substance 'n' - a unit mole), and e is the elementary charge or the magnitude of the charge of an

ctron. This relation is true because the amount of charge of a mole of electrons is equal to the amount of charge in one electron multiplied by the number of electrons in a mole.

e value ofFwas first determined by weighing the amount of silver deposited in an electrochemical reaction in which a measured current was passed for a measured time, and using

aday's law of electrolysis.[4] Research is continuing into more accurate ways of determining the interrelated constants F, NA

, and e.

Contents

1 Other Common Units of Faraday's Constant

2 Faraday unit of charge

3 See also

4 References

ther Common Units of Faraday's Constant

96,485 J (96.485 kJ) per volt gram equivalent

23.061 kcal per volt gram equivalent

26.801 Ah/mol

araday unit of charge

ated to Faraday's constant is the "faraday", a unit of electrical charge. It is much less common than the coulomb, but sometimes used in electrochemistry.[5] One Faraday of charge is

magnitude of the charge of one mole of electrons, i.e. 96,485.3365(21) C.[6]

pressed in faradays, the Faraday constant F equals "1 faraday of charge per mole".

s faraday unit is not to be confused with the farad, an unrelated unit of capacitance (1 farad= 1 coulomb/1 volt).

e also

Farad, unit of capacitance

Michael Faraday

Faraday cage

Faraday efficiency

Faraday's law of electrolysis

Faraday's law of Electromagnetic induction

eferences

1. ^ The term "magnitude" isused in the sense of "absolute value": The charge of an electron is negative, but Fis always defined to be positive.

2. ^ "CODATA Value: elementary charge" (http://physics.nist.gov/cgi-bin/cuu/Value?e). The NIST Reference on Constants, Units, and Uncertainty (http://physics.nist.gov/cuu/index.html). US National Institute

of Standards and Technology. June2011. Retrieved 2011-06-23.

3. ^ "CODATA Value: Avogadro constant" (http://physics.nist.gov/cgi-bin/cuu/Value?na). The NIST Reference on Constants, Units, and Uncertainty(http://physics.nist.gov/cuu/index.html). US NationalInstitute of Standards and Technology. June2011. Retrieved 2011-06-23.

4. ^ NIST Introduction to physical constants (http://physics.nist.gov/cuu/Constants/historical1.html)

5. ^ Foundations Of Physics, Volume 2, by R. S. Gambhir, p51 (http://books.google.com/books?id=r-Qpy0KQayIC&pg=PA51)

6. ^ "CODATA Value: Faraday constant" (http://physics.nist.gov/cgi-bin/cuu/Value?f). The NIST Reference on Constants, Units, and Uncertainty(http://physics.nist.gov/cuu/index.html). US National Institute of

Standards and Technology. June2011. Retrieved 2011-06-23.

rieved from "http://en.wikipedia.org/w/index.php?title=Faraday_constant&oldid=553294814"

egories: Electrochemistry Physical constants Michael Faraday Units of electrical charge Units of amount of substance Physical chemistry stubs Electromagnetism stubs

This page was last modified on 3 May 2013 at 03:22.

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