1. If it takes 67 mL of 0.15 M NaOH to neutralize 134 mL of an HCl solution, what is the concentration of the HCl?

2. If it takes 27.4 mL of 0.050 M H2SO4 to neutralize 357 mL of KOH solution, what is the concentration of the KOH solution?

3. If it takes 55 mL of 0.5 M NaOH solution to completely neutralize 130 mL of sulfuric acid solution (H2SO4), what is the concentration of the H2SO4 solution?

The answer to your question is 1) 0.0075  2) 0.0077   3) 0.0105

Explanation:

1.-

Chemical reaction

               NaOH + HCl  ⇒    NaCl   +   H₂O

Calculate the moles of reactants

Molarity = moles / volume

moles = molarity x volume

moles = 0.15 x 0.067

          = 0.001005 moles of NaOH

               1 moles of NaOH 1 moles of HCl

               0.001005 moles    x

                x = (0.001005 x 1)/ 1 = 0.001005 moles of HCl

Concentration of HCl = 0.001005/0.134

                                   = 0.0075 M

2)

Chemical reaction

         H₂SO₄   +   2KOH  ⇒   K₂SO₄  +  2H₂O

Calculate the moles of H₂SO₄

moles = molarity x volume

moles = 0.05 x 0.0274

moles = 0.00137

        1 mol of H₂SO₄ 2 moles of KOH

        0.00137              x

         x = (0.00137 x 2) / 1

         x = 0.00274 moles

Calculate the molarity

Molarity = 0.00274/0.357

Molarity = 0.0077

3)

Chemical reaction

      2NaOH  +   H₂SO₄   ⇒    Na₂SO₄   +   2H₂O

Calculate the moles of NaOH

moles = molarity x volume

moles = 0.5 x 0.055

          = 0.0275

         2 moles of NaOH  1 mol of H₂SO₄

          0.0275 moles        x

           x = (0.0275 x 1)/2

           x = 0.01375 moles of H₂SO₄

Molarity = 0.01375/0.130

Molarity = 0.0105

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

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).