Which of the following is the correct unit for molarity?

• A. mol/kg
• B. g/L
• C. L/mol
• D. mol/L

Answer: (D)

Verified step by step guidance

1. Understand that molarity is a measure of concentration defined as the number of moles of solute dissolved in one liter of solution.
2. Recall the formula for molarity: \(M = \frac{\text{moles of solute}}{\text{liters of solution}}\).
3. Analyze each given unit option to see if it matches the formula: mol/kg (moles per kilogram of solvent) is molality, not molarity; g/L (grams per liter) is a concentration unit but not molarity since it uses mass instead of moles; L/mol (liters per mole) is the inverse of molarity.
4. Confirm that the correct unit for molarity is \(\text{mol}/\text{L}\), which directly corresponds to moles of solute per liter of solution.
5. Conclude that among the options, only \(\text{mol}/\text{L}\) correctly represents molarity.