Molarity is defined as the number of moles of solute per

Molarity is defined as the number of moles of solute per

• A. Liter of solution
• B. Kilogram of solvent
• C. Gram of solute
• D. Liter of solvent

Answer: (A)

Concentration is expressed in terms of how many moles of solute are present in a given amount of space, specifically the whole solution. Molarity uses the volume of the entire solution, not just the solvent, which is why it’s defined as the number of moles of solute per liter of solution. This means the same amount of solute can yield different molarities if the solution’s total volume changes, such as with temperature changes that cause expansion or contraction. For example, dissolving 1 mole of solute in exactly 1 liter of solution gives a concentration of 1 M. If the same 1 mole occupies 2 liters of solution, the concentration drops to 0.5 M. This contrasts with molality, which is based on kilograms of solvent and is less sensitive to temperature since mass doesn’t change with temperature. So the phrase completes as “per liter of solution.”

Concentration is expressed in terms of how many moles of solute are present in a given amount of space, specifically the whole solution. Molarity uses the volume of the entire solution, not just the solvent, which is why it’s defined as the number of moles of solute per liter of solution. This means the same amount of solute can yield different molarities if the solution’s total volume changes, such as with temperature changes that cause expansion or contraction.

For example, dissolving 1 mole of solute in exactly 1 liter of solution gives a concentration of 1 M. If the same 1 mole occupies 2 liters of solution, the concentration drops to 0.5 M. This contrasts with molality, which is based on kilograms of solvent and is less sensitive to temperature since mass doesn’t change with temperature.

So the phrase completes as “per liter of solution.”