Understanding Molarity

Molarity (M) is a unit of concentration that expresses the number of moles of solute dissolved in one liter of solution. The formula for molarity is:

Molarity (M) = Moles of solute / Liters of solution

Calculation

1. Identify the known values:

- Moles of solute (sodium sulfate) = 0.491 moles

- Liters of solution = 3.45 L

2. Plug the values into the molarity formula:

Molarity (M) = 0.491 moles / 3.45 L

3. Calculate the molarity:

Molarity (M) = 0.142 M (approximately)

Therefore, the molarity of the 3.45 L solution containing 0.491 moles of sodium sulfate is approximately 0.142 M.