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©2013 UpToDate ® Print Email Atomic and molecular weight Substance Symbol or formula Atomic or molecular weight Calcium ion Ca2+ 40.1 Carbon C 12 Chloride ion Cl- 35.5 Hydrogen ion H+ 1.0 Magnesium ion Mg2+ 24.3 Nitrogen N 14 Oxygen O 16 Phosphorus P 31 Potassium ion K+ 39.1 Sodium ion Na+ 23 Sulfur S 32.1 Ammonia NH3 17 Ammonium ion NH4+ 18 Bicarbonate ion HCO3- 61 Carbon dioxide CO2 44 Glucose C(6)H(12)O(6) 180 Phosphate ion PO4(3-) 95 Sulfate ion SO4(2-) 96.1 Urea NH2CONH2 60 Water H2O 18 Atomic and molecular weights of physiologically important substances.