3 responses

  1. Kristella Henares
    March 14, 2015

    I beg to disagree. Atomic mass of an element is the weighted average mass of its isotopes. It is basically the same as the mass number (the number of protons + number of neutrons in an element). It is also similar to molar mass (mass of one mole of the substance). Molecular Weight, on the other hand, is not similar to atomic mass, neither it is similar to mass number nor molar mass. Molecular weight is the mass of the substance in amu that corresponds to the chemical formula of the substance. And to calculate molar mass, you need to use the atomic masses of all the elements that make up the substance(molecule).

    These definitions are taken from Chemistry Reader 2A by Andreas Toupadakis.


    • Kristella Henares
      March 14, 2015

      My bad. I meant to say molar mass is the same as molecular mass. However, it is different from atomic mass and mass number.


  2. Ashutosh mishra
    April 1, 2017

    One thing ,in case of monoatomic metal 1 molecule will be equal to 1 atom of the element.for ex sodium a molecular mass =23g and atomic mass is 23amu
    So ,when to consider atomic mass or molecular mass in chemical reaction


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