A solution contains 4.60 g KCl in 179 mL of solution. The density of the KCl solution is 1.11 g/mL

What is the percent (m/m) for the potassium chloride solution?
What is the molarity, M, for the potassium chloride solution? need help pls

mass soln = volume x density

%m/m = [g KCl/(g KCl + g solvent)]*100 =

M = mols/L soln.
mols = grams/molar mass. volume soln = 0.179L

To find the percent (m/m) for the potassium chloride solution, you need to calculate the mass of KCl in the solution and then divide it by the total mass of the solution, and finally multiply by 100.

Step 1: Calculate the mass of KCl in the solution.
Mass of KCl = 4.60 g

Step 2: Calculate the total mass of the solution.
Density = mass/volume
mass = density * volume
mass = 1.11 g/mL * 179 mL
mass = 198.69 g

Step 3: Calculate the percent (m/m).
Percent (m/m) = (mass of KCl / total mass of solution) * 100
Percent (m/m) = (4.60 g / 198.69 g) * 100
Percent (m/m) ≈ 2.31%

Therefore, the percent (m/m) for the potassium chloride solution is approximately 2.31%.

Now let's find the molarity (M) for the potassium chloride solution.

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

Step 1: Calculate the moles of KCl.
Moles of KCl = mass of KCl / molar mass of KCl

The molar mass of KCl can be calculated using the atomic masses of potassium (K) and chlorine (Cl).
Molar mass of KCl = atomic mass of K + atomic mass of Cl
Molar mass of KCl = 39.10 g/mol + 35.45 g/mol
Molar mass of KCl = 74.55 g/mol

Moles of KCl = 4.60 g / 74.55 g/mol
Moles of KCl ≈ 0.0617 mol

Step 2: Calculate the volume in liters.
Volume in liters = volume in mL / 1000
Volume in liters = 179 mL / 1000
Volume in liters = 0.179 L

Step 3: Calculate the molarity.
Molarity (M) = moles of KCl / volume in liters
Molarity (M) = 0.0617 mol / 0.179 L
Molarity (M) ≈ 0.344 M

Therefore, the molarity (M) for the potassium chloride solution is approximately 0.344 M.