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This template is used on approximately 19,000 pages and changes may be widely noticed. Test changes in the template's /sandbox or /testcases subpages, or in your own user subpage. Consider discussing changes on the talk page before implementing them.

This template calculates the molecular mass (or molar mass) of a chemical compound. It is designed to be embedded in infoboxes ((Infobox drug)) and ((Chembox)), but it can be used in-line just as well.

Rounding and uncertainty

(to be documented, 2019-02-09)

Parameters

Use chemical symbols to compose the molecular formula: ((Chem molar mass|H=2|O=1)) (for H₂O) → 18.015 g·mol⁻¹

|round=

|unit=

The next parameters will always show:
|fixed= to enter a fixed (predefined) value+unit. It will overwrite any calculated value+unit.

|ref=<ref>some source</ref> will add the reference right after the unit.

|comment=Any textis added as a suffix, after a space and unedited (no brackets added etc.).

Example:

((Chem molar mass|fixed=234.56 g·mol<sup>−1</sup>|ref=<ref>Some source</ref>|comment=My Comment)) → 234.56 g·mol⁻¹^[1] My Comment

|sortable=yes, for use in sortable tables: will add a hidden sortable number, and omits the unit (see table below).

Blank parameter list

((Chem molar mass
| round   =
| unit    =
| fixed   =
| ref     =
| comment =
| sortable=
))

((Chem molar mass
<!-- with 118 chemical symbols: -->|D= |H= |He= |Li= |Be= |B= |C= |N= |O= |F= |Ne= |Na= |Mg= |Al= |Si= |P= |S= |Cl= |Ar= |K= |Ca= |Sc= |Ti= |V= |Cr= |Mn= |Fe= |Co= |Ni= |Cu= |Zn= |Ga= |Ge= |As= |Se= |Br= |Kr= |Rb= |Sr= |Y= |Zr= |Nb= |Mo= |Tc= |Ru= |Rh= |Pd= |Ag= |Cd= |In= |Sn= |Sb= |Te= |I= |Xe= |Cs= |Ba= |La= |Ce= |Pr= |Nd= |Pm= |Sm= |Eu= |Gd= |Tb= |Dy= |Ho= |Er= |Tm= |Yb= |Lu= |Hf= |Ta= |W= |Re= |Os= |Ir= |Pt= |Au= |Hg= |Tl= |Pb= |Bi= |Po= |At= |Rn= |Fr= |Ra= |Ac= |Th= |Pa= |U= |Np= |Pu= |Am= |Cm= |Bk= |Cf= |Es= |Fm= |Md= |No= |Lr= |Rf= |Db= |Sg= |Bh= |Hs= |Mt= |Ds= |Rg= |Cn= |Nh= |Lv= |Mc= |Fl= |Ts= |Og=
| round   =
| unit    =
| fixed   =
| ref     =
| comment =
| sortable=
))

Standard atomic weights used

v t e Chem molar mass tests
Atomic number	Element		Molar mass	Formal standard atomic weight	s.a.w., formal short	Note
Z			calculated; g·mol⁻¹	A_{r, standard}^[2] (data)	A_{r, abridged and conventional}^[2]

		C₉H₈O₄	180.159 g·mol⁻¹			aspirin, calculated from formula
		C₉H₈O₄	180.157 g·mol⁻¹			fixed value from ...
		`\|charge=+1`	−0.000548579909070 g·mol⁻¹
		`\|charge=-1`	0.000548579909070 g·mol⁻¹
		H⁺¹	1.007 g·mol⁻¹
1	hydrogen	H	1.008 g·mol⁻¹	[1.00784, 1.00811]	[1.00784, 1.00811]	atomic mass for H, not molar mass for H₂
	[[]]	D	2.01355321275 g·mol⁻¹			deuterium, ²H^[3]
2	helium	He	4.002602 g·mol⁻¹	4.002602±0.000002	4.002602±0.000002
3	lithium	Li	6.94 g·mol⁻¹	[6.938, 6.997]	[6.938, 6.997]
4	beryllium	Be	9.0121831 g·mol⁻¹	9.0121831±0.0000005	9.0121831±0.0000005
5	boron	B	10.81 g·mol⁻¹	[10.806, 10.821]	[10.806, 10.821]
6	carbon	C	12.011 g·mol⁻¹	[12.0096, 12.0116]	[12.0096, 12.0116]
7	nitrogen	N	14.007 g·mol⁻¹	[14.00643, 14.00728]	[14.00643, 14.00728]
8	oxygen	O	15.999 g·mol⁻¹	[15.99903, 15.99977]	[15.99903, 15.99977]
9	fluorine	F	18.998403163 g·mol⁻¹	18.998403162±0.000000005	18.998403162±0.000000005
10	neon	Ne	20.1797 g·mol⁻¹	20.1797±0.0006	20.1797±0.0006
11	sodium	Na	22.98976928 g·mol⁻¹	22.98976928±0.00000002	22.98976928±0.00000002
12	magnesium	Mg	24.305 g·mol⁻¹	[24.304, 24.307]	[24.304, 24.307]
13	aluminium	Al	26.9815384 g·mol⁻¹	26.9815384±0.0000003	26.9815384±0.0000003
14	silicon	Si	28.085 g·mol⁻¹	[28.084, 28.086]	[28.084, 28.086]
15	phosphorus	P	30.973761998 g·mol⁻¹	30.973761998±0.000000005	30.973761998±0.000000005
16	sulfur	S	32.06 g·mol⁻¹	[32.059, 32.076]	[32.059, 32.076]
17	chlorine	Cl	35.45 g·mol⁻¹	[35.446, 35.457]	[35.446, 35.457]
18	argon	Ar	39.948 g·mol⁻¹	[39.792, 39.963]	[39.792, 39.963]
19	potassium	K	39.0983 g·mol⁻¹	39.0983±0.0001	39.0983±0.0001
20	calcium	Ca	40.078 g·mol⁻¹	40.078±0.004	40.078±0.004
21	scandium	Sc	44.955908 g·mol⁻¹	44.955907±0.000004	44.955907±0.000004
22	titanium	Ti	47.867 g·mol⁻¹	47.867±0.001	47.867±0.001
23	vanadium	V	50.9415 g·mol⁻¹	50.9415±0.0001	50.9415±0.0001
24	chromium	Cr	51.9961 g·mol⁻¹	51.9961±0.0006	51.9961±0.0006
25	manganese	Mn	54.938043 g·mol⁻¹	54.938043±0.000002	54.938043±0.000002
26	iron	Fe	55.845 g·mol⁻¹	55.845±0.002	55.845±0.002
27	cobalt	Co	58.933194 g·mol⁻¹	58.933194±0.000003	58.933194±0.000003
28	nickel	Ni	58.6934 g·mol⁻¹	58.6934±0.0004	58.6934±0.0004
29	copper	Cu	63.546 g·mol⁻¹	63.546±0.003	63.546±0.003
30	zinc	Zn	65.38 g·mol⁻¹	65.38±0.02	65.38±0.02
31	gallium	Ga	69.723 g·mol⁻¹	69.723±0.001	69.723±0.001
32	germanium	Ge	72.630 g·mol⁻¹	72.630±0.008	72.630±0.008
33	arsenic	As	74.921595 g·mol⁻¹	74.921595±0.000006	74.921595±0.000006
34	selenium	Se	78.971 g·mol⁻¹	78.971±0.008	78.971±0.008
35	bromine	Br	79.904 g·mol⁻¹	[79.901, 79.907]	[79.901, 79.907]
36	krypton	Kr	83.798 g·mol⁻¹	83.798±0.002	83.798±0.002
37	rubidium	Rb	85.4678 g·mol⁻¹	85.4678±0.0003	85.4678±0.0003
38	strontium	Sr	87.62 g·mol⁻¹	87.62±0.01	87.62±0.01
39	yttrium	Y	88.90584 g·mol⁻¹	88.905838±0.000002	88.905838±0.000002
40	zirconium	Zr	91.224 g·mol⁻¹	91.224±0.002	91.224±0.002
41	niobium	Nb	92.90637 g·mol⁻¹	92.90637±0.00001	92.90637±0.00001
42	molybdenum	Mo	95.95 g·mol⁻¹	95.95±0.01	95.95±0.01
43	technetium	Tc	98 g·mol⁻¹
44	ruthenium	Ru	101.07 g·mol⁻¹	101.07±0.02	101.07±0.02
45	rhodium	Rh	102.90549 g·mol⁻¹	102.90549±0.00002	102.90549±0.00002
46	palladium	Pd	106.42 g·mol⁻¹	106.42±0.01	106.42±0.01
47	silver	Ag	107.8682 g·mol⁻¹	107.8682±0.0002	107.8682±0.0002
48	cadmium	Cd	112.414 g·mol⁻¹	112.414±0.004	112.414±0.004
49	indium	In	114.818 g·mol⁻¹	114.818±0.001	114.818±0.001
50	tin	Sn	118.710 g·mol⁻¹	118.710±0.007	118.710±0.007
51	antimony	Sb	121.760 g·mol⁻¹	121.760±0.001	121.760±0.001
52	tellurium	Te	127.60 g·mol⁻¹	127.60±0.03	127.60±0.03	(Does not follow atomic number)
53	iodine	I	126.90447 g·mol⁻¹	126.90447±0.00003	126.90447±0.00003	(Does not follow atomic number)
54	xenon	Xe	131.293 g·mol⁻¹	131.293±0.006	131.293±0.006
55	caesium	Cs	132.90545196 g·mol⁻¹	132.90545196±0.00000006	132.90545196±0.00000006
56	barium	Ba	137.327 g·mol⁻¹	137.327±0.007	137.327±0.007
57	lanthanum	La	138.90547 g·mol⁻¹	138.90547±0.00007	138.90547±0.00007
58	cerium	Ce	140.116 g·mol⁻¹	140.116±0.001	140.116±0.001
59	praseodymium	Pr	140.90766 g·mol⁻¹	140.90766±0.00001	140.90766±0.00001
60	neodymium	Nd	144.242 g·mol⁻¹	144.242±0.003	144.242±0.003
61	promethium	Pm	145 g·mol⁻¹
62	samarium	Sm	150.36 g·mol⁻¹	150.36±0.02	150.36±0.02
63	europium	Eu	151.964 g·mol⁻¹	151.964±0.001	151.964±0.001
64	gadolinium	Gd	157.25 g·mol⁻¹	157.25±0.03	157.25±0.03
65	terbium	Tb	158.925354 g·mol⁻¹	158.925354±0.000007	158.925354±0.000007
66	dysprosium	Dy	162.500 g·mol⁻¹	162.500±0.001	162.500±0.001
67	holmium	Ho	164.930328 g·mol⁻¹	164.930329±0.000005	164.930329±0.000005
68	erbium	Er	167.259 g·mol⁻¹	167.259±0.003	167.259±0.003
69	thulium	Tm	168.934218 g·mol⁻¹	168.934219±0.000005	168.934219±0.000005
70	ytterbium	Yb	173.045 g·mol⁻¹	173.045±0.010	173.045±0.010
71	lutetium	Lu	174.9668 g·mol⁻¹	174.9668±0.0001	174.9668±0.0001
72	hafnium	Hf	178.49 g·mol⁻¹	178.486±0.006	178.486±0.006
73	tantalum	Ta	180.94788 g·mol⁻¹	180.94788±0.00002	180.94788±0.00002
74	tungsten	W	183.84 g·mol⁻¹	183.84±0.01	183.84±0.01
75	rhenium	Re	186.207 g·mol⁻¹	186.207±0.001	186.207±0.001
76	osmium	Os	190.23 g·mol⁻¹	190.23±0.03	190.23±0.03
77	iridium	Ir	192.217 g·mol⁻¹	192.217±0.002	192.217±0.002
78	platinum	Pt	195.084 g·mol⁻¹	195.084±0.009	195.084±0.009
79	gold	Au	196.966570 g·mol⁻¹	196.966570±0.000004	196.966570±0.000004
80	mercury	Hg	200.592 g·mol⁻¹	200.592±0.003	200.592±0.003
81	thallium	Tl	204.38 g·mol⁻¹	[204.382, 204.385]	[204.382, 204.385]
82	lead	Pb	207.2 g·mol⁻¹	[206.14, 207.94]	[206.14, 207.94]
83	bismuth	Bi	208.98040 g·mol⁻¹	208.98040±0.00001	208.98040±0.00001
84	polonium	Po	209 g·mol⁻¹
85	astatine	At	210 g·mol⁻¹
86	radon	Rn	222 g·mol⁻¹
87	francium	Fr	223 g·mol⁻¹
88	radium	Ra	226 g·mol⁻¹
89	actinium	Ac	227 g·mol⁻¹
90	thorium	Th	232.0377 g·mol⁻¹	232.0377±0.0004	232.0377±0.0004
91	protactinium	Pa	231.03588 g·mol⁻¹	231.03588±0.00001	231.03588±0.00001
92	uranium	U	238.02891 g·mol⁻¹	238.02891±0.00003	238.02891±0.00003
93	neptunium	Np	237 g·mol⁻¹
94	plutonium	Pu	244 g·mol⁻¹
95	americium	Am	243 g·mol⁻¹
96	curium	Cm	247 g·mol⁻¹
97	berkelium	Bk	247 g·mol⁻¹
98	californium	Cf	251 g·mol⁻¹
99	einsteinium	Es	252 g·mol⁻¹
100	fermium	Fm	257 g·mol⁻¹
101	mendelevium	Md	258 g·mol⁻¹
102	nobelium	No	259 g·mol⁻¹
103	lawrencium	Lr	266 g·mol⁻¹
104	rutherfordium	Rf	267 g·mol⁻¹
105	dubnium	Db	268 g·mol⁻¹
106	seaborgium	Sg	269 g·mol⁻¹
107	bohrium	Bh	270 g·mol⁻¹
108	hassium	Hs	270 g·mol⁻¹
109	meitnerium	Mt	278 g·mol⁻¹
110	darmstadtium	Ds	281 g·mol⁻¹
111	roentgenium	Rg	282 g·mol⁻¹
112	copernicium	Cn	285 g·mol⁻¹
113	nihonium	Nh	286 g·mol⁻¹
114	flerovium	Fl	289 g·mol⁻¹
115	moscovium	Mc	290 g·mol⁻¹
116	livermorium	Lv	293 g·mol⁻¹
117	tennessine	Ts	294 g·mol⁻¹
118	oganesson	Og	294 g·mol⁻¹

References

^ Some source
^ ^a ^b Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
^ NIST [1]

Data sources (CIAAW)

Primarily, the atomic weights used here are defined by CIAAW [2]:

"Standard Atomic Weights". Commission on Isotopic Abundances and Atomic Weights (CIAAW). 2015. Retrieved 2015-09-20. (68 elements)
CIAAW also published additional lists in spreadsheet format (2013). It has additional conventional values for trade usage, and some background information on the numbers and calculations. (12 elements: B, Br, C, Cl, H, Li, Mg, N, O, S, Si, Tl).

Coplen, T.B.; et al. (2013). "Atomic weights of the elements 2013 (xls)". CIAAW. Retrieved 2015-05-26.

Some unstable elements can naturally occur, and so are listed (4 elements: Bi, Th, Pa, U)
Additional values are those of the most stable isotopes, as given in List of chemical elements (34 elements). This source is not supported by the CIAAW publications.

See also: "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. February 2016. pp. 265–291. doi:10.1515/pac-2015-0305. eISSN 1365-3075. ISSN 0033-4545. Retrieved 2016-12-29.

Possolo, Antonio; van der Veen, Adriaan M. H.; Meija, Juris; Hibbert, D. Brynn (2018-01-04). "Interpreting and propagating the uncertainty of the standard atomic weights (IUPAC Technical Report)". doi:10.1515/pac-2016-0402. Retrieved 2018-09-23.

Embedding in a template

The template is designed to be embedded in a template like ((Drugbox)). The molecular formula can be entered like ...|H=2|O=1, and these values then are passed through to this subtemplate, together with the other parameters like |round=.

Units

|unit=

1. When some |unit=kg/mol is used, it is added as is, always ("by the editor").

2. When |fixed= is used, no unit is added to this (could be in it already).

3. When |sortable= is used, no unit is added by the template (expected: put in top of table column).

4. When value is calculated, unit g/mol is added by template.

5. There is automatic no conversion from g to kg.

Uncertainty handling

Uncertainty is ignored.

Calcium: A_r(Ca) being 40.078(4) is read and calculated as 40.078(0)

Elements having interval notation are calculated by their conventional value.

Hydrogen: [1.00784, 1.00811] is calculated using conventional: 1.008(0)

Calculate cumulative uncertainties

Possolo, Antonio; van der Veen, Adriaan M.H.; Meija, Juris; Brynn Hibbert, D. (2018-01-04). "Interpreting and propagating the uncertainty of the standard atomic weights (IUPAC Technical Report)". Retrieved 2019-02-08.
[3], [4]

Tracking categories

TemplateData

This is the TemplateData for this template used by TemplateWizard, VisualEditor and other tools. See a monthly parameter usage report for Template:Chem molar mass in articles based on its TemplateData.

TemplateData for Chem molar mass

Parameter list (all element symbols, and template options)

No description.

Template parameters[Edit template data]
Parameter		Description	Type	Status
H	`H`	no description	Unknown	optional
D	`D`	no description	Unknown	optional
Li	`Li`	no description	Unknown	optional
B	`B`	no description	Unknown	optional
C	`C`	no description	Unknown	optional
N	`N`	no description	Unknown	optional
O	`O`	no description	Unknown	optional
Mg	`Mg`	no description	Unknown	optional
Si	`Si`	no description	Unknown	optional
S	`S`	no description	Unknown	optional
Cl	`Cl`	no description	Unknown	optional
Br	`Br`	no description	Unknown	optional
Tl	`Tl`	no description	Unknown	optional
He	`He`	no description	Unknown	optional
Be	`Be`	no description	Unknown	optional
F	`F`	no description	Unknown	optional
Ne	`Ne`	no description	Unknown	optional
Na	`Na`	no description	Unknown	optional
Al	`Al`	no description	Unknown	optional
P	`P`	no description	Unknown	optional
K	`K`	no description	Unknown	optional
Ar	`Ar`	no description	Unknown	optional
Ca	`Ca`	no description	Unknown	optional
Sc	`Sc`	no description	Unknown	optional
Ti	`Ti`	no description	Unknown	optional
V	`V`	no description	Unknown	optional
Cr	`Cr`	no description	Unknown	optional
Mn	`Mn`	no description	Unknown	optional
Fe	`Fe`	no description	Unknown	optional
Ni	`Ni`	no description	Unknown	optional
Co	`Co`	no description	Unknown	optional
Cu	`Cu`	no description	Unknown	optional
Zn	`Zn`	no description	Unknown	optional
Ga	`Ga`	no description	Unknown	optional
Ge	`Ge`	no description	Unknown	optional
As	`As`	no description	Unknown	optional
Se	`Se`	no description	Unknown	optional
Kr	`Kr`	no description	Unknown	optional
Rb	`Rb`	no description	Unknown	optional
Sr	`Sr`	no description	Unknown	optional
Y	`Y`	no description	Unknown	optional
Zr	`Zr`	no description	Unknown	optional
Nb	`Nb`	no description	Unknown	optional
Mo	`Mo`	no description	Unknown	optional
Ru	`Ru`	no description	Unknown	optional
Rh	`Rh`	no description	Unknown	optional
Pd	`Pd`	no description	Unknown	optional
Ag	`Ag`	no description	Unknown	optional
Cd	`Cd`	no description	Unknown	optional
In	`In`	no description	Unknown	optional
Sn	`Sn`	no description	Unknown	optional
Sb	`Sb`	no description	Unknown	optional
I	`I`	no description	Unknown	optional
Te	`Te`	no description	Unknown	optional
Xe	`Xe`	no description	Unknown	optional
Cs	`Cs`	no description	Unknown	optional
Ba	`Ba`	no description	Unknown	optional
La	`La`	no description	Unknown	optional
Ce	`Ce`	no description	Unknown	optional
Pr	`Pr`	no description	Unknown	optional
Nd	`Nd`	no description	Unknown	optional
Sm	`Sm`	no description	Unknown	optional
Eu	`Eu`	no description	Unknown	optional
Gd	`Gd`	no description	Unknown	optional
Tb	`Tb`	no description	Unknown	optional
Dy	`Dy`	no description	Unknown	optional
Ho	`Ho`	no description	Unknown	optional
Er	`Er`	no description	Unknown	optional
Tm	`Tm`	no description	Unknown	optional
Yb	`Yb`	no description	Unknown	optional
Lu	`Lu`	no description	Unknown	optional
Hf	`Hf`	no description	Unknown	optional
Ta	`Ta`	no description	Unknown	optional
W	`W`	no description	Unknown	optional
Re	`Re`	no description	Unknown	optional
Os	`Os`	no description	Unknown	optional
Ir	`Ir`	no description	Unknown	optional
Pt	`Pt`	no description	Unknown	optional
Au	`Au`	no description	Unknown	optional
Hg	`Hg`	no description	Unknown	optional
Pb	`Pb`	no description	Unknown	optional
Bi	`Bi`	no description	Unknown	optional
Pa	`Pa`	no description	Unknown	optional
Th	`Th`	no description	Unknown	optional
U	`U`	no description	Unknown	optional
Tc	`Tc`	no description	Unknown	optional
Pm	`Pm`	no description	Unknown	optional
Po	`Po`	no description	Unknown	optional
At	`At`	no description	Unknown	optional
Rn	`Rn`	no description	Unknown	optional
Fr	`Fr`	no description	Unknown	optional
Ra	`Ra`	no description	Unknown	optional
Ac	`Ac`	no description	Unknown	optional
Np	`Np`	no description	Unknown	optional
Pu	`Pu`	no description	Unknown	optional
Am	`Am`	no description	Unknown	optional
Cm	`Cm`	no description	Unknown	optional
Bk	`Bk`	no description	Unknown	optional
Cf	`Cf`	no description	Unknown	optional
Es	`Es`	no description	Unknown	optional
Fm	`Fm`	no description	Unknown	optional
Md	`Md`	no description	Unknown	optional
No	`No`	no description	Unknown	optional
Lr	`Lr`	no description	Unknown	optional
Rf	`Rf`	no description	Unknown	optional
Db	`Db`	no description	Unknown	optional
Sg	`Sg`	no description	Unknown	optional
Bh	`Bh`	no description	Unknown	optional
Hs	`Hs`	no description	Unknown	optional
Mt	`Mt`	no description	Unknown	optional
Ds	`Ds`	no description	Unknown	optional
Rg	`Rg`	no description	Unknown	optional
Cn	`Cn`	no description	Unknown	optional
Nh	`Nh`	no description	Unknown	optional
Fl	`Fl`	no description	Unknown	optional
Mc	`Mc`	no description	Unknown	optional
Lv	`Lv`	no description	Unknown	optional
Ts	`Ts`	no description	Unknown	optional
Og	`Og`	no description	Unknown	optional
round	`round`	no description	Unknown	optional
unit	`unit`	no description	Unknown	optional
ref	`ref`	no description	Unknown	optional
comment	`comment`	no description	Unknown	optional
fixed	`fixed`	no description	Unknown	optional
sortable	`sortable`	no description	Unknown	optional