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nitrogen (78%) and oxygen (21%)

CO2 and Methane gas are 2 important gasses that vary in amount but are critical in determining the amount of heat the atmosphere absorbed.

Heat is either absorbed or released when water changes forms.

3 solids in the atmosphere are dust, pollen and salt.

A gas controls the amount of UV light that enters the atmosphere is ozone, a molecule made of 3 oxygen atoms.

Other gasses that are present in the atmosphere include methane, water vapor, CO2, and neon

Explanation:

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: