*Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu #Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No LrĬlick on the element to view its propertiesĮlement (sym) # Mass density oxid #'s mp bp EN Ionization Energy rad. And don’t forget to put the unit g/mol to your final calculated molar mass.The Periodic Table of the Elements 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* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac#.First solve the brackets, then multiplications and at last do the final addition. Always follow the calculation order to avoid any mistakes in calculation.But all these units (i.e g/mol, grams/mole and g/mole) are the same. In some books, you may see the unit of molar mass as grams/mole or g/mole.I hope you have understood the short and simple calculation for finding the molar mass of Na2O. Hence the Molar mass of Na2O is 61.979 g/mol. So, Molar mass of Na2O = Molar mass of 2 Sodium (Na) atoms + Molar mass of 1 Oxygen (O) atom. You can see that in Na2O, there are 2 Sodium atoms and 1 Oxygen atom. Now, to calculate the molar mass of Na2O, you just have to add the molar mass of all the individual atoms that are present in Na2O.