Can someone help me with this question pls

I know you probably don't need the answer now but here ya go :P

Explanation:

Potassium chloride, makes a purple flame, the metal in Potassium chloride is called potassium (if it's not obvious) the non-metal element in Potassium chloride is chloride.(again duh XD) Last but not least, Potassium spectra in the 700–7000 cm-^1 domain: Transitions involving f-, g-, and h-states!

TA-DA! You now have a decent answer that most likely is right because i'm not good at science at all!

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:

the answer is 75.0%.