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Molar Mass

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Element

Rounded

( for regular calculations )

Standard

( for precise calculations )

Aluminum

26.982 g/mol

  26.9815384 ± 0.0000003 g/mol  

Antimony

121.76 g/mol

     121.760 ± 0.001 g/mol      

Argon

39.95 g/mol

39.792 g/mol to 39.963 g/mol

Arsenic

74.922 g/mol

   74.921595 ± 0.000006 g/mol   

Barium

137.33 g/mol

     137.327 ± 0.007 g/mol      

Beryllium

9.0122 g/mol

   9.0121831 ± 0.0000005 g/mol  

Bismuth

208.98 g/mol

   208.98040 ± 0.00001 g/mol    

Boron

10.81 g/mol

10.806 g/mol to 10.821 g/mol

Bromine

79.904 g/mol

79.901 g/mol to 79.907 g/mol

Cadmium

112.41 g/mol

     112.414 ± 0.004 g/mol      

Calcium

40.078 g/mol

      40.078 ± 0.004 g/mol      

Carbon

12.011 g/mol

12.0096 g/mol to 12.0116 g/mol

Cerium

140.12 g/mol

     140.116 ± 0.001 g/mol      

Cesium

132.91 g/mol

132.90545196 ± 0.00000006 g/mol 

Chlorine

35.45 g/mol

35.446 g/mol to 35.457 g/mol

Chromium

51.996 g/mol

     51.9961 ± 0.0006 g/mol     

Cobalt

58.933 g/mol

   58.933194 ± 0.000003 g/mol   

Copper

63.546 g/mol

      63.546 ± 0.003 g/mol      

Dysprosium

162.50 g/mol

     162.500 ± 0.001 g/mol      

Erbium

167.26 g/mol

     167.259 ± 0.003 g/mol      

Europium

151.96 g/mol

     151.964 ± 0.001 g/mol      

Fluorine

18.998 g/mol

18.998403162 ± 0.000000005 g/mol

Gadolinium

157.25 g/mol

      157.25 ± 0.03 g/mol       

Gallium

69.723 g/mol

      69.723 ± 0.001 g/mol      

Germanium

72.630 g/mol

      72.630 ± 0.008 g/mol      

Gold

196.97 g/mol

  196.966570 ± 0.000004 g/mol   

Hafnium

178.49 g/mol

     178.486 ± 0.006 g/mol      

Helium

4.0026 g/mol

    4.002602 ± 0.000002 g/mol   

Holmium

164.93 g/mol

  164.930329 ± 0.000005 g/mol   

Hydrogen

1.0080 g/mol

1.00784 g/mol to 1.00811 g/mol

Indium

114.82 g/mol

     114.818 ± 0.001 g/mol      

Iodine

126.90 g/mol

   126.90447 ± 0.00003 g/mol    

Iridium

192.22 g/mol

     192.217 ± 0.002 g/mol      

Iron

55.845 g/mol

      55.845 ± 0.002 g/mol      

Krypton

83.798 g/mol

      83.798 ± 0.002 g/mol      

Lanthanum

138.91 g/mol

   138.90547 ± 0.00007 g/mol    

Lead

207.2 g/mol

206.14 g/mol to 207.94 g/mol

Lithium

6.94 g/mol

6.938 g/mol to 6.997 g/mol

Lutetium

174.97 g/mol

    174.9668 ± 0.0001 g/mol     

Magnesium

24.305 g/mol

24.304 g/mol to 24.307 g/mol

Manganese

54.938 g/mol

   54.938043 ± 0.000002 g/mol   

Mercury

200.59 g/mol

     200.592 ± 0.003 g/mol      

Molybdenum

95.95 g/mol

       95.95 ± 0.01 g/mol       

Neodymium

144.24 g/mol

     144.242 ± 0.003 g/mol      

Neon

20.180 g/mol

     20.1797 ± 0.0006 g/mol     

Nickel

58.693 g/mol

     58.6934 ± 0.0004 g/mol     

Niobium

92.906 g/mol

    92.90637 ± 0.00001 g/mol    

Nitrogen

14.007 g/mol

14.00643 g/mol to 14.00728 g/mol

Osmium

190.23 g/mol

      190.23 ± 0.03 g/mol       

Oxygen

15.999 g/mol

15.99903 g/mol to 15.99977 g/mol

Palladium

106.42 g/mol

      106.42 ± 0.01 g/mol       

Phosphorus

30.974 g/mol

30.973761998 ± 0.000000005 g/mol

Platinum

195.08 g/mol

     195.084 ± 0.009 g/mol      

Potassium

39.098 g/mol

     39.0983 ± 0.0001 g/mol     

Praseodymium

140.91 g/mol

   140.90766 ± 0.00001 g/mol    

Protactinium

231.04 g/mol

   231.03588 ± 0.00001 g/mol    

Rhenium

186.21 g/mol

     186.207 ± 0.001 g/mol      

Rhodium

102.91 g/mol

   102.90549 ± 0.00002 g/mol    

Rubidium

85.468 g/mol

     85.4678 ± 0.0003 g/mol     

Ruthenium

101.07 g/mol

      101.07 ± 0.02 g/mol       

Samarium

150.36 g/mol

      150.36 ± 0.02 g/mol       

Scandium

44.956 g/mol

   44.955907 ± 0.000004 g/mol   

Selenium

78.971 g/mol

      78.971 ± 0.008 g/mol      

Silicon

28.085 g/mol

28.084 g/mol to 28.086 g/mol

Silver

107.87 g/mol

    107.8682 ± 0.0002 g/mol     

Sodium

22.990 g/mol

 22.98976928 ± 0.00000002 g/mol 

Strontium

87.62 g/mol

       87.62 ± 0.01 g/mol       

Sulfur

32.06 g/mol

32.059 g/mol to 32.076 g/mol

Tantalum

180.95 g/mol

   180.94788 ± 0.00002 g/mol    

Tellurium

127.60 g/mol

      127.60 ± 0.03 g/mol       

Terbium

158.93 g/mol

  158.925354 ± 0.000007 g/mol   

Thallium

204.38 g/mol

204.382 g/mol to 204.385 g/mol

Thorium

232.04 g/mol

    232.0377 ± 0.0004 g/mol     

Thulium

168.93 g/mol

  168.934219 ± 0.000005 g/mol   

Tin

118.71 g/mol

     118.710 ± 0.007 g/mol      

Titanium

47.867 g/mol

      47.867 ± 0.001 g/mol      

Tungsten

183.84 g/mol

      183.84 ± 0.01 g/mol       

Uranium

238.03 g/mol

   238.02891 ± 0.00003 g/mol    

Vanadium

50.942 g/mol

     50.9415 ± 0.0001 g/mol     

Xenon

131.29 g/mol

     131.293 ± 0.006 g/mol      

Ytterbium

173.05 g/mol

     173.045 ± 0.010 g/mol      

Yttrium

88.906 g/mol

   88.905838 ± 0.000002 g/mol   

Zinc

65.38 g/mol

       65.38 ± 0.02 g/mol       

Zirconium

91.224 g/mol

      91.224 ± 0.002 g/mol      

References    (Click the button next to a value above to see complete citation information for that entry)

Prohaska, Thomas, Johanna Irrgeher, Jacqueline Benefield, John K. Böhlke, Lesley A. Chesson, Tyler B. Coplen, Tiping Ding, Philip J. H. Dunn, Manfred Gröning, Norman E. Holden, Harro A. J. Meijer, Heiko Moossen, Antonio Possolo, Yoshio Takahashi, Jochen Vogl, Thomas Walczyk, Jun Wang, Michael E. Wieser, Shigekazu Yoneda, Xiang-Kun Zhu, and Juris Meija. "Standard Atomic Weights of the Elements 2021 (IUPAC Technical Report)." Pure and Applied Chemistry, volume 94, number 5, 2022, pp. 573–600. doi:10.1515/pac-2019-0603

Wieser, Michael E., and Tyler B. Coplen. "Atomic weights of the elements 2009 (IUPAC Technical Report)." Pure and Applied Chemistry, volume 83, number 2, 2011, pp. 359–396. doi:10.1351/PAC-REP-10-09-14

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