What is the grams per liter in a 3.45 M NaCl solution? (MW ≈ 58 g/mol)

What is the grams per liter in a 3.45 M NaCl solution? (MW ≈ 58 g/mol)

• A. 200 g/L
• B. 100 g/L
• C. 50 g/L
• D. 58 g/L

Answer: (A)

Grams per liter comes from multiplying the molarity by the molar mass. For NaCl, with a molar mass of about 58 g per mole, a 3.45 M solution has 3.45 moles of NaCl per liter. Multiply: 3.45 × 58 ≈ 200 g per liter. So the concentration is about 200 g/L. Using a more exact molar mass (58.44 g/mol) would give roughly 202 g/L, but with the given approximate value, 200 g/L is the appropriate result. The other numbers would imply much lower molarities and don’t match a 3.45 M solution.

Grams per liter comes from multiplying the molarity by the molar mass. For NaCl, with a molar mass of about 58 g per mole, a 3.45 M solution has 3.45 moles of NaCl per liter. Multiply: 3.45 × 58 ≈ 200 g per liter. So the concentration is about 200 g/L. Using a more exact molar mass (58.44 g/mol) would give roughly 202 g/L, but with the given approximate value, 200 g/L is the appropriate result. The other numbers would imply much lower molarities and don’t match a 3.45 M solution.