A solution of H 2 SO 4 ( aq ) H2SO4(aq) with a molal concentration of 4.80 m 4.80 m has a density of 1.249 g / mL . 1.249 g/mL. What is the molar concentration of this solution?

The answer to your question is Molarity = 4

Explanation:

Data

molalidad = 4.8

density = 1.249 g/ml

molarity = ?

Process

1.- Calculate the moles of H₂SO₄

   molality = moles / kilogram

Solve for moles

   moles = molality x kilogram

Substitution

   moles = 4.8 x 1

Result

   moles = 4.8 moles

2.- Calculate the mass

- Mass of solute

 Molar mass of H₂SO₄ = 2 + 32 + 64

                                      = 98 g

          98 g 1 mol

            x     4.8 moles

           x = (4.8 x 98)/1

           x = 470.4 g

Total mass = 470.4 + 1000

                  = 1470.4 g

3.- Calculate the volume

Density = mass/volume

Volume = mass/density

Substitution

Volume = 1470.4/1.249

             = 1177.3 ml

4.- Calculate molarity

Molarity = moles / volume (L)

Molarity = 4.8 / 1.177

Molarity = 4.0      

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