Question 2 of 10 Which is an example of a scientist using a mathematical model to describe the atom? O A. The scientist uses ping-pong balls to represent protons, neutrons, and electrons. O B. The scientist thinks of the atom as being like a planet and its moons. O C. The scientist has a computer calculate how far the electrons are from the nucleus. D. The scientist draws a picture of an atom, being as accurate as possible

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)

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