At 25.0°c, a solution has a concentration of 3.179 m and a density of 1.260 g/ml. the density of the solution at 50.0°c is 1.249 g/ml. what is the molarity of the solution at 50.0 °c?

-

3.151 M

Explanation: -

Let the volume of the solution be 1000 mL.

At 25.0 °C, Density = 1.260 g/ mL

Mass of the solution = Density x volume

= 1.260 g / mL x 1000 mL

= 1260 g

At 25.0 °C, the molarity = 3.179 M

Number of moles present per 1000 mL = 3.179 mol

Strength of the solution in g / mol

= 1260 g / 3.179 mol = 396.35 g / mol (at 25.0 °C)

Now at 50.0 °C

The density is 1.249 g/ mL

Mass of the solution = density x volume = 1.249 g / mL x 1000 mL

= 1249 g.

Number of moles present in 1249 g = Mass of the solution / Strength in g /mol

=

= 3.151 moles.

So 3.151 moles is present in 1000 mL at 50.0 °C

Molarity at 50.0 °C = 3.151 M

The answer to your question is below

Explanation:

Data

Aqueous sodium carbonate = Na₂CO₃ (aq)

Aqueous strontium chloride = SrCl₂ (aq)

Solid strontium carbonate = SrCO₃ (s)

Aqueous sodium chloride = NaCl (aq)

Unbalnced Chemical reaction

                  Na₂CO₃(aq)  +   SrCl₂(aq)   ⇒  SrCO₃(s)  +  NaCl(aq)

                       Reactants               Elements        Products

                             2                       Sodium                  1

                              1                       Carbon                   1

                              1                       Strontium                1

                              2                       Chlorine                 1

                              3                       Oxygen                  3

Balanced Chemical reaction

                  Na₂CO₃(aq)  +   SrCl₂(aq)   ⇒  SrCO₃(s)  +  2NaCl(aq)

                       Reactants               Elements        Products

                             2                       Sodium                  2

                              1                       Carbon                   1

                              1                       Strontium               1

                              2                       Chlorine                2

                              3                       Oxygen                 3