Meh i’ll give and plz don’t do anything dumb because i really need this, i’m taking a final.

question 9 (fill-in-the-blank worth 2 points)
(03.05 lc)

which number represents an acidic ph, 4 or 9?

numerical answers expected!

answer for blank 1:

4

Explanation: acid has pH ranges from 1 to 6.

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: