KingDre504
contestada

The molar mass of KCl is 74.55 g/mol. If 8.45 g KCl are dissolved in 0.750 L of solution, what is the molarity of the solution?
0.113 M
0.151 M
6.62 M
11.3 M

Respuesta :

transitionstate

Answer:

                  Molarity  =  0.1516 mol.L⁻¹

Solution:

             Molarity is the amount of solute dissolved per unit volume of solution. It is expressed as,

                         Molarity  =  Moles / Volume of Solution    ----- (1)

Data Given;

                  Mass  =  8.45 g

                  Volume  =  0.750 L

Step 1: Calculate Moles for given mass as,

                   Moles  =  Mass / M.mass

                   Moles  =  8.45 g / 74.55 g.mol⁻¹

                   Moles  =  0.1133 mol

Step 2: Calculating Molarity:

Now, putting value of Moles and Volume in eq. 1,

                        Molarity  =  0.1133 mol ÷ 0.750 L

                        Molarity  =  0.1516 mol.L⁻¹

Molar concentration or molarity is defined as the ratio of moles of a solute dissolved in the given volume of the solvent.

How do you calculate the molarity using the formula?

Given:

  • Molar mass of Potassium Chloride = 74.55 g/mol
  • Given the mass of Potassium Chloride = 8.45 g
  • The volume of the solution = 0.750 L

Now, to calculate the number of moles, we get:

[tex]\rm Moles &=\dfrac{Mass}{Molar Mass}\\\\\\Moles &= \dfrac{8.45}{74.55}\\[/tex]

Moles = 0.113 mol

Then, the molarity of the solution will be:

[tex]\rm Molarity &= \dfrac{number \; of \; moles}{Volume\;of \; Solution}\\\\\\\rm Molarity &= \dfrac{0.113}{0.151}[/tex]

Molarity = 0.1516 mol/L

Thus, the molarity of the given solution is 0.1516 mol/L. The correct answer is Option B.

Learn more about molarity here:

https://brainly.com/question/12127540

Otras preguntas