Using the relationship of 1 mole of an element = relative atomic mass = molar mass in grams Since 1 mole of an element = molar mass ( mass of 1 mole of an element) Number of moles of an element x relative atomic mass = mass of element in grams
1 mole of element –Ar 1 mole of molecules – Mr – sum of Ar of the elements that made up that molecules If the compound is covalent we use the term relative molecular mass, if the compound is ionic, we use the term relative formula mass. When doing calculations, can just use the abbreviation M r