You are making 100 ml of a 2 M solution of HCl. How many ml of a 4 M HCl solution will you require

Known :

M1 = 2 M

V1 = 100 mL

M2 = 4 M

Solution :

M1 • V1 = M2 • V2

(2 M)(100 mL) = (4 M)(V2)

V2 = 50 mL

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:

confused

confused             hewdejdnjnjsnd