Question

What is the molarity of a solution prepared by dissolving 5.85 g of NaCl in 500 mL of water? 
(Molar mass of NaCl = 58.5 g/mol)

• A. 0.1 M
• B. 0.2 M
• C. 1.0 M
• D. 2.0 M

Hint:

Molarity = moles of solute / volume of solution in liters.

Answer 1

The Correct Option is B

- Calculate the number of moles of NaCl: \[ \text{moles} = \frac{5.85\, \text{g}}{58.5\, \text{g/mol}} = 0.1\, \text{mol} \] - Volume of solution = 500 mL = 0.5 L - Molarity (M) = \(\frac{\text{moles}}{\text{volume in liters}} = \frac{0.1}{0.5} = 0.2\, \text{M}\) 
 Answer: \(\boxed{\text{B}}\)