Determine the molarity of a solution made by dissolving 13.8 g of sodium chloride in enough water to make 750.0 mL of solution. (The MM of NaCl is 58.44 g/mol)

mols NaCl = 13.8g/molar mass NaCl = ?

Then M = ?mols/L soln.

0.24

To determine the molarity of a solution, we need to calculate the number of moles of the solute (sodium chloride) and divide it by the volume of the solution in liters.

First, we need to convert the mass of sodium chloride to moles. We can use the formula:

moles = mass / molar mass

Given:
Mass of NaCl = 13.8 g
Molar mass of NaCl = 58.44 g/mol

Calculating the moles of NaCl:
moles = 13.8 g / 58.44 g/mol
≈ 0.2361 mol

Next, we need to convert the volume of the solution from milliliters to liters. Since 1 liter is equal to 1000 milliliters, we can use the formula:

volume (in liters) = volume (in milliliters) / 1000

Given:
Volume of solution = 750.0 mL

Calculating the volume of the solution in liters:
volume (in liters) = 750.0 mL / 1000
= 0.750 L

Now, we can calculate the molarity of the solution using the formula:

molarity (M) = moles / volume (in liters)

Plugging in the values:
molarity = 0.2361 mol / 0.750 L
≈ 0.3148 M

Therefore, the molarity of the solution is approximately 0.3148 M.

To find the molarity of a solution, we need to use the formula:

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

First, we need to determine the moles of sodium chloride (NaCl). To do this, we divide the mass of NaCl by its molar mass:

moles of NaCl = mass of NaCl / molar mass of NaCl

moles of NaCl = 13.8 g / 58.44 g/mol

moles of NaCl = 0.236 mol

Next, we need to convert the volume of the solution from milliliters to liters:

volume of solution = 750.0 mL / 1000 mL/L

volume of solution = 0.75 L

Now, we can substitute the values into the formula to calculate the molarity:

Molarity (M) = 0.236 mol / 0.75 L

Molarity ≈ 0.315 M

Therefore, the molarity of the solution is approximately 0.315 M.