Atomic mass units - Revision history

Carl McBride at 16:57, 29 October 2007

2007-10-29T16:57:52Z

← Older revision		Revision as of 18:57, 29 October 2007
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	\| Compound/element \|\| mass in amu		\| Compound/element \|\| mass in amu
	\|-		\|-
	\| Ar \|\| 39.948		\| Ar ([[argon]])\|\| 39.948
	\|-		\|-
	\| C \|\| 12.0107		\| C \|\| 12.0107
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	\| Xe \|\| 131.293		\| Xe \|\| 131.293
	\|-		\|-
	\| CO<sub>2</sub>\|\| 44.0095		\| CO<sub>2</sub> ([[carbon dioxide]])\|\| 44.0095
	\|-		\|-
	\| H \|\| 1.00794		\| H \|\| 1.00794
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	\| H<sub>2</sub>O ([[water]]) \|\| 18.02		\| H<sub>2</sub>O ([[water]]) \|\| 18.02
	\|-		\|-
	\| N<sub>2</sub> \|\| 28.01		\| N<sub>2</sub> ([[nitrogen]])\|\| 28.01
	\|}		\|}
	Note that sometimes the atomic mass unit is also known as the '''Dalton''' ('''Da'''), especially when dealing with macromolecules such as [[proteins]].		Note that sometimes the atomic mass unit is also known as the '''Dalton''' ('''Da'''), especially when dealing with macromolecules such as [[proteins]].

2007-10-29T16:51:40Z

2007-10-29T16:49:47Z

← Older revision		Revision as of 18:49, 29 October 2007
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			{{numeric}}
	The '''atomic mass unit''' (AMU) is defined as the twelfth part		The '''atomic mass unit''' (AMU) is defined as the twelfth part
	of the mass of a C<math>_{12}</math> atom.		of the mass of a C<math>_{12}</math> atom.
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	\| Compound/element \|\| mass in amu		\| Compound/element \|\| mass in amu
	\|-		\|-
	\| Ar \|\| 39.95		\| Ar \|\| 39.948
	\|-		\|-
	\| Xe \|\| ~~131~~.29		\| C \|\| 12.0107
	\|-		\|-
	\| CO<sub>2</sub>\|\| 44.01		\| -CH<sub>2</sub>- \|\| 14.02658
			\|-
			\| -CH<sub>3</sub> \|\| 15.03452
			\|-
			\| Xe \|\| 131.293
			\|-
			\| CO<sub>2</sub>\|\| 44.0095
			\|-
			\| H \|\| 1.00794
	\|-		\|-
	\| H<sub>2</sub>O ([[water]]) \|\| 18.02		\| H<sub>2</sub>O ([[water]]) \|\| 18.02
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	Note that sometimes the atomic mass unit is also known as the '''Dalton''' ('''Da'''), especially when dealing with macromolecules such as [[proteins]].		Note that sometimes the atomic mass unit is also known as the '''Dalton''' ('''Da'''), especially when dealing with macromolecules such as [[proteins]].
	==References==		==References==
			#[http://www.iupac.org/reports/periodic_table/index.html IUPAC Periodic Table]
	[[Category: Physical constants]]		[[Category: Physical constants]]

2007-10-25T13:00:20Z

Mentioned Daltons

← Older revision		Revision as of 15:00, 25 October 2007
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	\| N<sub>2</sub> \|\| 28.01		\| N<sub>2</sub> \|\| 28.01
	\|}		\|}
			Note that sometimes the atomic mass unit is also known as the '''Dalton''' ('''Da'''), especially when dealing with macromolecules such as [[proteins]].
	==References==		==References==
	[[Category: Physical constants]]		[[Category: Physical constants]]

2007-10-25T11:59:52Z

← Older revision		Revision as of 13:59, 25 October 2007
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	\| N<sub>2</sub> \|\| 28.01		\| N<sub>2</sub> \|\| 28.01
	\|}		\|}
			==References==
			[[Category: Physical constants]]

2007-10-25T11:33:55Z

← Older revision		Revision as of 13:33, 25 October 2007
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	The ~~Atomic Mass Unit~~ is defined as the twelfth part		The '''atomic mass unit''' (AMU) is defined as the twelfth part
	of the mass of a C<math>_{12}</math> atom.		of the mass of a C<math>_{12}</math> atom.
	Its value (in SI units,		Its value (in SI units,
Line 7:		Line 7:
	Hence,		Hence,
	it is approximately equal to the mass of a proton.		it is approximately equal to the mass of a proton.
	Elements are ~~asigned~~ masses in these units which are		Elements are assigned masses in these units which are
	not integer numbers. This is because		not integer numbers. This is because
	neutrons and protons have slightly different masses,		neutrons and protons have slightly different masses,
	because nuclear binding forces cause the total mass		because nuclear binding forces cause the total mass
	of a ~~nucleum~~ to be less than that of the sum of		of a nucleus to be less than that of the sum of
	its constituents, and, mainly, because of the		its constituents, and, mainly, because of the
	appearance of natural isotopes. Thus, Potassium		appearance of natural isotopes. Thus, Potassium
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	isotopes.		isotopes.

	Here is a list of masses of elements and compounds in ~~amus~~:		Here is a list of masses of elements and compounds in atomic mass units:
	{\| border="1"		{\| border="1"
	\|-		\|-

2007-10-25T11:28:47Z

Added subscripts

2007-10-25T11:00:57Z

← Older revision	Revision as of 13:00, 25 October 2007
(No difference)

2007-10-25T10:58:43Z

Added internal link to water

2007-10-25T10:57:10Z

← Older revision		Revision as of 12:57, 25 October 2007
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	The Atomic Mass Unit is defined as the twelfth part		The Atomic Mass Unit is defined as the twelfth part
	of the mass of a C<math>_{12}</math> atom.		of the mass of a C<math>_{12}</math> atom.
	~~This~~ is <math>1.66054\times10^{-27} </math> kilograms		Its value (in SI units,
	~~in SI units.~~		[http://physics.nist.gov/cgi-bin/cuu/Value?tukg\|search_for=atomic+mass+unit CODATA] value) is
			:<math>1.66054\times10^{-27} </math> kilograms

	Hence,		Hence,
	it is approximately equal to the mass of a proton.		it is approximately equal to the mass of a proton.