Copper has two isotopes. the one isotope (copper-63) has an abundance of 69.2% and a mass of 62.930 amu. the second isotope (copper-65) has an abundance of 30.8% and a mass of 64.928 amu. calculate the average atomic mass of copper. 62.930 amu 63.545 amu 63.929 amu 64.928 amu

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

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