Question

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? Use Molarity equals StartFraction moles of solute over liters of solution EndFraction. 0. 113 M 0. 151 M 6. 62 M 11. 3 M.

Answer 1

Molarity is the strength of the solution or the ratio of the moles and the volume of the solution. The molarity of the solution is 0.1516 mol per Liter.

What is molarity?

Molarity is the molar concentration of the solution that tells about the amount of the solute or the substance dissolved in the given amount of the solution.

Given,

• Mass of potassium chloride = 8.45 g
• Molar mass of potassium chloride = 74. 55 g/mol
• Volume of the solution = 0.750 L

Moles can be calculated by:

$\begin{aligned}\rm Moles &= \rm \dfrac{Mass }{\rm Molar \;mass}\\\\&= \dfrac{8.45}{74.55}\\\\&= 0.1133\;\rm mol\end{aligned}$

Calculate molarity by:

$\rm Molarity = \dfrac{moles}{\text{Volume in L}}$

Substituting values in the equation:

$\begin{aligned}\rm Molarity &= \dfrac{0.1133}{0.750}\\\\&= 0.1516 \;\rm mol\;L^{-1}\end{aligned}$

Therefore, the molarity of the solution is 0.1516 mol per Liter.

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