What is the molarity of 225 mL of a KNO3 solution containing 34.8 g KNO3? (molar mass = 101.1 g/mol)

A) 0.344 M

B) 1.53 M

C) 15.5 M

Considering the definition of molarity, the correct answer is option B: The molarity of the KNO₃ solution is 1.53 M.

Molar concentration is a measure of the concentration of a solute in a solution that indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

Molarity is expressed in units .

In this case, you know:

Replacing in the definition of molarity:

Solving:

molarity= 1.53 M

Finally, the correct answer is option B: The molarity of the KNO₃ solution is 1.53 M.

Learn more about molarity with this example: link

The answer to your question is the letter B) 1.53 M

Explanation:

Data

Molarity = ?

volume = 225 ml

mass of KNO₃ = 34.8 g

molar mass = 101.1 g/mol

Process

1.- Convert the ml to liters

                  1000 ml 1 l

                   225 ml x

                   x = (225 x 1) / 1000

                   x = 0.225 l

2.- Convert the mass of KNO₃ to moles

                  101.1 g 1 mol

                   34.8 g x

                        x = (34.8 x 1) / 101.1

                        x = 0.344 moles

3.- Calculate the Molarity

Molarity = moles/volume

-Substitution

Molarity = 0.344/ 0.225

-Result

Molarity = 1.53 M