Predloga:Chem molar mass

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

Parameters

Use chemical symbols to compose the molecular formula: {{Chem molar mass|H=2|O=1}} (for H
₂O) → 18,02 g·mol⁻¹

|round= by default the calculated number is rounded to 2 decimals.

|round=no will show all decimals:

{{Chem molar mass|Be=1|round=no}} → 9.0121831 g·mol⁻¹

|round=a number will round to that number of decimals

{{Chem molar mass|Be=1|round=4}} → 9,0122 g·mol⁻¹

|unit= changes the unit for the calculated result. The default unit is g·mol⁻¹.

{{Chem molar mass|H=2|O=1|unit=gram per mole}} → 18,02 gram per mole

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|ref=<ref>Some source</ref>|comment=My Comment}} → 234.56 g/mol^[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=
| catname =
}}

{{Chem molar mass
<!-- 118 chemical symbols: -->|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= |Uub= |Uut= |Lv= |Uup= |Fl= |Uus= |Uuo=
| round   =
| unit    =
| fixed   =
| ref     =
| comment =
| sortable=
| catname =
}}

Standard atomic weights used

Atomic number Z	Element	Molar mass g/mol	Note

0	C ₉H ₈O ₄	7005180157000000000180.157	fixed value input
0	C ₉H ₈O ₄	7005180157000000000180.157 g/mol	fixed value input
0	C ₉H ₈O ₄	7005180159000000000180.159	aspirin
1	H	70031008000000000001.008
2	He	70064002602000000004.002602
3	Li	70026940000000000006.94
4	Be	70079012183100000009.0121831
5	B	700310810000000000010.81
6	C	700412011000000000012.011
7	N	700414007000000000014.007
8	O	700415999000000000015.999
9	F	701018998403163000018.998403163
10	Ne	700520179700000000020.1797
11	Na	700922989769280000022.98976928
12	Mg	700424305000000000024.305
13	Al	700826981538500000026.9815385
14	Si	700428085000000000028.085
15	P	701030973761998000030.973761998
16	S	700332060000000000032.06
17	Cl	700335450000000000035.45
18	Ar	700439948000000000039.948
19	K	700539098300000000039.0983
20	Ca	700440078000000000040.078
21	Sc	700744955908000000044.955908
22	Ti	700447867000000000047.867
23	V	700550941500000000050.9415
24	Cr	700551996100000000051.9961
25	Mn	700754938044000000054.938044
26	Fe	700455845000000000055.845
27	Co	700758933194000000058.933194
28	Ni	700558693400000000058.6934
29	Cu	700463546000000000063.546
30	Zn	700365380000000000065.38
31	Ga	700469723000000000069.723
32	Ge	700372630000000000072.63
33	As	700774921595000000074.921595
34	Se	700478971000000000078.971
35	Br	700479904000000000079.904
36	Kr	700483798000000000083.798
37	Rb	700585467800000000085.4678
38	Sr	700387620000000000087.62
39	Y	700688905840000000088.90584
40	Zr	700491224000000000091.224
41	Nb	700692906370000000092.90637
42	Mo	700395950000000000095.95
43	Tc	700198000000000000098
44	Ru	7004101070000000000101.07
45	Rh	7006102905500000000102.9055
46	Pd	7004106420000000000106.42
47	Ag	7006107868200000000107.8682
48	Cd	7005112414000000000112.414
49	In	7005114818000000000114.818
50	Sn	7004118710000000000118.71
51	Sb	7004121760000000000121.76
52	Te	7003127600000000000127.6	(Does not follow atomic number)
53	I	7007126904470000000126.90447	(Does not follow atomic number)
54	Xe	7005131293000000000131.293
55	Cs	7010132905451960000132.90545196
56	Ba	7005137327000000000137.327
57	La	7007138905470000000138.90547
58	Ce	7005140116000000000140.116
59	Pr	7007140907660000000140.90766
60	Nd	7005144242000000000144.242
61	Pm	7002145000000000000145
62	Sm	7004150360000000000150.36
63	Eu	7005151964000000000151.964
64	Gd	7004157250000000000157.25
65	Tb	7007158925350000000158.92535
66	Dy	7003162500000000000162.5
67	Ho	7007164930330000000164.93033
68	Er	7005167259000000000167.259
69	Tm	7007168934220000000168.93422
70	Yb	7005173045000000000173.045
71	Lu	7006174966800000000174.9668
72	Hf	7004178490000000000178.49
73	Ta	7007180947880000000180.94788
74	W	7004183840000000000183.84
75	Re	7005186207000000000186.207
76	Os	7004190230000000000190.23
77	Ir	7005192217000000000192.217
78	Pt	7005195084000000000195.084
79	Au	7008196966569000000196.966569
80	Hg	7005200592000000000200.592
81	Tl	7004204380000000000204.38
82	Pb	7003207200000000000207.2
83	Bi	7006208980400000000208.9804
84	Po	7002209000000000000209
85	At	7002210000000000000210
86	Rn	7002222000000000000222
87	Fr	7002223000000000000223
88	Ra	7002226000000000000226
89	Ac	7002227000000000000227
90	Th	7006232037700000000232.0377
91	Pa	7007231035880000000231.03588
92	U	7007238028910000000238.02891
93	Np	7002237000000000000237
94	Pu	7002244000000000000244
95	Am	7002243000000000000243
96	Cm	7002247000000000000247
97	Bk	7002247000000000000247
98	Cf	7002251000000000000251
99	Es	7002252000000000000252
100	Fm	7002257000000000000257
101	Md	7002258000000000000258
102	No	7002259000000000000259
103	Lr	7002266000000000000266
104	Rf	7002267000000000000267
105	Db	7002268000000000000268
106	Sg	7002269000000000000269
107	Bh	7002270000000000000270
108	Hs	7002269000000000000269
109	Mt	7002278000000000000278
110	Ds	7002281000000000000281
111	Rg	7002281000000000000281
112	Cn	7002285000000000000285
113	Uut	7002286000000000000286
114	Fl	7002289000000000000289
115	Uup	7002289000000000000289
116	Lv	7002293000000000000293
117	Uus	7002294000000000000294
118	Uuo	7002294000000000000294

Data sources (CIAAW)

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

»Standard Atomic Weights«. Commission on Isotopic Abundances and Atomic Weights (CIAAW). 2015. Pridobljeno 20. septembra 2015. (68 elements)
CIAAW also published additional lists in spreadsheet format (2013). It has additional conventional values for trade usage (12 elements), and some background information on the numbers and calculations.

Coplen, T.B.; Brand, W.A. (2013). »Atomic weights of the elements 2013 (xls)«. CIAAW. Pridobljeno 26. maja 2015.

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.

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=.

For this usage one extra parameter is available:
|catname=. A category name entered here, which will be used as maintenance category for articles that have both calculated and fixed input. These are two inputs for one data value. The maintenance task is to remove the |fixed= input (unless overwriting is intentional).

Know issue: uncertainty

Atomic weights are given with a precision and uncertainty, for example: 20.1797(6) for neon (more here).

Uncertainty

This template does not maintain the uncertainty (the bracketed part). When done correctly, the uncertainty could influence the result, especially when precision (number of decimals) is larger.

Rounding

This template usually does rounding on the calculated result, to 2 decimals by default:

For neon: {{Chem molar mass|Ne=1}} → 20,18 g·mol⁻¹

Two decimals is common practice for trade and most laboratory situations. However, rounding is set to more decimals, and the compounnd has atoms with less precision, the resulting number will be inaccurate (suggesting a wrong precision). For example strontium :

{{Chem molar mass|Sr=1|round=4}} → 87,6200 g·mol⁻¹

Six elements have values ending with a final decimal being "0" (a zero), like Sn: 118.710. This value does not show for technical reasons (the calculation 'rounds them away'), but it does signify an extra precision. The six elements are Sn, Rh, Ge, Sb, Dy, Bi.

Calculate cumulative uncertainties

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