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Molar Mass

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Element

Rounded

( for regular calculations )

Standard

( for precise calculations )

Aluminum

26.98 g/mol

 26.9815386 ± 0.0000008 g/mol 

Antimony

121.8 g/mol

    121.760 ± 0.001 g/mol     

Argon

39.95 g/mol

     39.948 ± 0.001 g/mol     

Arsenic

74.92 g/mol

   74.92160 ± 0.00002 g/mol   

Barium

137.3 g/mol

    137.327 ± 0.007 g/mol     

Beryllium

9.012 g/mol

   9.012182 ± 0.000003 g/mol  

Bismuth

209.0 g/mol

  208.98040 ± 0.00001 g/mol   

Boron

10.81 g/mol

10.806 g/mol to 10.821 g/mol

Bromine

79.90 g/mol

     79.904 ± 0.001 g/mol     

Cadmium

112.4 g/mol

    112.411 ± 0.008 g/mol     

Calcium

40.08 g/mol

     40.078 ± 0.004 g/mol     

Carbon

12.011 g/mol

12.0096 g/mol to 12.0116 g/mol

Cerium

140.1 g/mol

    140.116 ± 0.001 g/mol     

Cesium

132.9 g/mol

132.9054519 ± 0.0000002 g/mol 

Chlorine

35.45 g/mol

35.446 g/mol to 35.457 g/mol

Chromium

52.00 g/mol

    51.9961 ± 0.0006 g/mol    

Cobalt

58.93 g/mol

  58.933195 ± 0.000005 g/mol  

Copper

63.55 g/mol

     63.546 ± 0.003 g/mol     

Dysprosium

162.5 g/mol

    162.500 ± 0.001 g/mol     

Erbium

167.3 g/mol

    167.259 ± 0.003 g/mol     

Europium

152.0 g/mol

    151.964 ± 0.001 g/mol     

Fluorine

19.00 g/mol

 18.9984032 ± 0.0000005 g/mol 

Gadolinium

157.3 g/mol

     157.25 ± 0.03 g/mol      

Gallium

69.72 g/mol

     69.723 ± 0.001 g/mol     

Germanium

72.63 g/mol

      72.63 ± 0.01 g/mol      

Gold

197.0 g/mol

 196.966569 ± 0.000004 g/mol  

Hafnium

178.5 g/mol

     178.49 ± 0.02 g/mol      

Helium

4.003 g/mol

   4.002602 ± 0.000002 g/mol  

Holmium

164.9 g/mol

  164.93032 ± 0.00002 g/mol   

Hydrogen

1.008 g/mol

1.00784 g/mol to 1.00811 g/mol

Indium

114.8 g/mol

    114.818 ± 0.003 g/mol     

Iodine

126.9 g/mol

  126.90447 ± 0.00003 g/mol   

Iridium

192.2 g/mol

    192.217 ± 0.003 g/mol     

Iron

55.85 g/mol

     55.845 ± 0.002 g/mol     

Krypton

83.80 g/mol

     83.798 ± 0.002 g/mol     

Lanthanum

138.9 g/mol

  138.90547 ± 0.00007 g/mol   

Lead

207.2 g/mol

      207.2 ± 0.1 g/mol       

Lithium

6.94 g/mol

6.938 g/mol to 6.997 g/mol

Lutetium

175.0 g/mol

   174.9668 ± 0.0001 g/mol    

Magnesium

24.31 g/mol

    24.3050 ± 0.0006 g/mol    

Manganese

54.94 g/mol

  54.938045 ± 0.000005 g/mol  

Mercury

200.6 g/mol

     200.59 ± 0.02 g/mol      

Molybdenum

95.96 ± 0.02 g/mol

      95.96 ± 0.02 g/mol      

Neodymium

144.2 g/mol

    144.242 ± 0.003 g/mol     

Neon

20.18 g/mol

    20.1797 ± 0.0006 g/mol    

Nickel

58.69 g/mol

    58.6934 ± 0.0004 g/mol    

Niobium

92.91 g/mol

   92.90638 ± 0.00002 g/mol   

Nitrogen

14.007 g/mol

14.00643 g/mol to 14.00728 g/mol

Osmium

190.2 g/mol

     190.23 ± 0.03 g/mol      

Oxygen

15.999 g/mol

15.99903 g/mol to 15.99977 g/mol

Palladium

106.4 g/mol

     106.42 ± 0.01 g/mol      

Phosphorus

30.97 g/mol

  30.973762 ± 0.000002 g/mol  

Platinum

195.1 g/mol

    195.084 ± 0.009 g/mol     

Potassium

39.10 g/mol

    39.0983 ± 0.0001 g/mol    

Praseodymium

140.9 g/mol

  140.90765 ± 0.00002 g/mol   

Protactinium

231.0 g/mol

  231.03588 ± 0.00002 g/mol   

Rhenium

186.2 g/mol

    186.207 ± 0.001 g/mol     

Rhodium

102.9 g/mol

  102.90550 ± 0.00002 g/mol   

Rubidium

85.47 g/mol

    85.4678 ± 0.0003 g/mol    

Ruthenium

101.1 g/mol

     101.07 ± 0.02 g/mol      

Samarium

150.4 g/mol

     150.36 ± 0.02 g/mol      

Scandium

44.96 g/mol

  44.955912 ± 0.000006 g/mol  

Selenium

78.96 ± 0.03 g/mol

      78.96 ± 0.03 g/mol      

Silicon

28.085 g/mol

28.084 g/mol to 28.086 g/mol

Silver

107.9 g/mol

   107.8682 ± 0.0002 g/mol    

Sodium

22.99 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

180.9 g/mol

  180.94788 ± 0.00002 g/mol   

Tellurium

127.6 g/mol

     127.60 ± 0.03 g/mol      

Terbium

158.9 g/mol

  158.92535 ± 0.00002 g/mol   

Thallium

204.38 g/mol

204.382 g/mol to 204.385 g/mol

Thorium

232.0 g/mol

  232.03806 ± 0.00002 g/mol   

Thulium

168.9 g/mol

  168.93421 ± 0.00002 g/mol   

Tin

118.7 g/mol

    118.710 ± 0.007 g/mol     

Titanium

47.87 g/mol

     47.867 ± 0.001 g/mol     

Tungsten

183.8 g/mol

     183.84 ± 0.01 g/mol      

Uranium

238.0 g/mol

  238.02891 ± 0.00003 g/mol   

Vanadium

50.94 g/mol

    50.9415 ± 0.0001 g/mol    

Xenon

131.3 g/mol

    131.293 ± 0.006 g/mol     

Ytterbium

173.1 g/mol

    173.054 ± 0.005 g/mol     

Yttrium

88.91 g/mol

   88.90585 ± 0.00002 g/mol   

Zinc

65.38 ± 0.02 g/mol

      65.38 ± 0.02 g/mol      

Zirconium

91.22 g/mol

     91.224 ± 0.002 g/mol     

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

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