When using the ideal gas constant value, r = 0.0821, in an ideal gas law calculation, the units of pressure may be expressed in units of atmospheres or kilopascals.

true

false

The answer to your question is: pressure is expressed in atmosphers.

Explanation:

Data

R = 0.0821

Ideal gas constant

R = 0.08205 atm l / mol °K

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:

you did not give any options thus this is the best answer i can give to you with this little information you have given

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