Which quantity is required to calculate molarity?

Which quantity is required to calculate molarity?

• A. Moles of solute and liters of solution
• B. Grams of solute and liters of solvent
• C. Moles of solute and kilograms of solvent
• D. Grams of solvent and liters of solution

Answer: (A)

Molarity is defined as the amount of solute in moles per liter of the entire solution. To calculate it, you must know how much solute you have, expressed in moles, and the total volume of the solution after the solute is dissolved, measured in liters. That’s why the needed quantities are moles of solute and liters of solution. Grams of solute could be converted to moles using the molar mass, but you still need the final volume of the solution, not the solvent. Grams of solvent with liters of solution don’t directly give the mole-per-liter ratio either, since you must know the amount of solute in moles. Therefore, the essential quantities are moles of solute and liters of solution, which together form the molarity in moles per liter.

Molarity is defined as the amount of solute in moles per liter of the entire solution. To calculate it, you must know how much solute you have, expressed in moles, and the total volume of the solution after the solute is dissolved, measured in liters. That’s why the needed quantities are moles of solute and liters of solution.

Grams of solute could be converted to moles using the molar mass, but you still need the final volume of the solution, not the solvent. Grams of solvent with liters of solution don’t directly give the mole-per-liter ratio either, since you must know the amount of solute in moles. Therefore, the essential quantities are moles of solute and liters of solution, which together form the molarity in moles per liter.