What volume of 6.58 M HCl is needed to make 500 mL of 3.00M HCl?

228mL of the 6.58M HCl

Explanation:

Molarity is an unit of concentration defined as the ratio between moles of solute (HCl, in this case) and liters of solution.

To make 500 mL of 3.00M HCl you need:

0.500L × (3.00mol HCl / 1L) = 1.5moles HCl

You can obtain these 1.5moles of HCl from a solution more concentrated, as 6.58M HCl. To obtain these moles you need to add:

1.5mol HCl × (1L / 6.58mol HCl) = 0.228L 6.58M HCl =

228mL of the 6.58M HCl

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:

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).