1.69 L of an aqueous solution containing 25.00 g of KCl dissolved in pure water is prepared. What is the molarity of the solution?

change grams to moles using the periodic table then use this equation

molarity=
moles of solute/liters of solution

0.198

To calculate the molarity of the solution, you need to know the number of moles of solute (KCl) and the volume of the solution.

The molarity (M) is defined as the number of moles of solute per liter of solution.

First, let's calculate the number of moles of KCl:

Number of moles of KCl = Mass of KCl / Molar mass of KCl

The molar mass of KCl can be found using the periodic table. The molar mass of potassium (K) is 39.10 g/mol, and the molar mass of chloride (Cl) is 35.45 g/mol. Thus, the molar mass of KCl is:

Molar mass of KCl = (1 x Molar mass of K) + (1 x Molar mass of Cl)
= (1 x 39.10 g/mol) + (1 x 35.45 g/mol)
= 39.10 g/mol + 35.45 g/mol
= 74.55 g/mol

Let's substitute the values into the formula now:

Number of moles of KCl = 25.00 g / 74.55 g/mol
≈ 0.3351 mol

Next, let's calculate the molarity of the solution:

Molarity (M) = Number of moles of solute / Volume of solution (in liters)

Given that the volume of the solution is 1.69 L, we can substitute the values:

Molarity (M) = 0.3351 mol / 1.69 L
≈ 0.198 M

Therefore, the molarity of the solution is approximately 0.198 M.

To determine the molarity of the solution, you need to first calculate the number of moles of potassium chloride (KCl) present in the solution, and then divide that by the volume of the solution in liters.

Step 1: Calculate the number of moles of KCl.
To do this, you need to use the molar mass of KCl, which is the sum of the atomic masses of potassium (K) and chlorine (Cl).
The atomic mass of K is 39.10 g/mol, and the atomic mass of Cl is 35.45 g/mol.
The molar mass of KCl is 39.10 + 35.45 = 74.55 g/mol.

To find the number of moles, divide the mass of KCl by its molar mass:
moles = mass / molar mass
moles = 25.00 g / 74.55 g/mol

Step 2: Calculate the molarity of the solution.
Molarity is defined as moles of solute per liter of solution.
Given that the solution has a volume of 1.69 L, we can calculate the molarity using the equation:
Molarity (M) = moles / volume

Substituting the values we have:
Molarity (M) = (25.00 g / 74.55 g/mol) / 1.69 L

Calculating this will give you the molarity of the solution.