Convert mol/L to weight/volume or weight/weight percentage using molar mass and solution density required for weight/weight, or solve for molarity or molar mass.

% w/v means g per 100 mL of final solution; % w/w means g per 100 g of solution and requires its actual density. Use the exact chemical form. This is conversion arithmetic, not preparation or dosing advice.

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mol/L To Percentage Formula

The following formula is used to calculate the percentage concentration from molarity, molar mass, and density.

P (% w / w) = (M × MM × 100) / D P (% w / v) = M × MM / 10

Variables:

  • P is mass percentage (% w/w) when density is included; % w/v means grams per 100 mL
  • M is the molarity (mol/L)
  • MM is the molar mass (g/mol)
  • D is the density (g/L)

For % w/w, multiply molarity by molar mass and 100, then divide by actual solution density in g/L. For % w/v, divide molarity times molar mass by 10; density is not needed. The table uses a hypothetical fixed density, not measured NaCl solution densities.

Molarity to Mass Percentage (% w/w) Conversion Table (Sodium Chloride, ρ ≈ 1.00 g/mL)
Molarity (mol/L) Molar Mass (g/mol) Density (g/L) Percentage (%)
0.0158.4410000.058
0.0258.4410000.117
0.0558.4410000.292
0.1058.4410000.584
0.2058.4410001.169
0.2558.4410001.461
0.3058.4410001.753
0.4058.4410002.338
0.5058.4410002.922
0.7558.4410004.383
1.0058.4410005.844
1.2558.4410007.305
1.5058.4410008.766
2.0058.44100011.688
2.5058.44100014.610
3.0058.44100017.532
3.5058.44100020.454
4.0058.44100023.376
4.5058.44100026.298
5.0058.44100029.220
* Rounded to 3 decimals. Formula: % = (M × molar mass × 100) / density. Assumes NaCl (58.44 g/mol) and solution density ≈ 1.00 g/mL (1000 g/L).

What is mol/L To Percentage?

mol/L to percentage is a conversion used in chemistry to express the concentration of a solution. Molarity (mol/L) is a measure of the number of moles of solute per liter of solution, while percentage concentration is the amount of solute in a given amount of solution, expressed as a percentage. This conversion is useful for preparing solutions and for understanding the concentration of solutions in different units.

How to Calculate mol/L To Percentage?

The following steps outline how to calculate the percentage concentration from molarity, molar mass, and density.

  1. First, determine the molarity (M) of the solution.
  2. Next, determine the molar mass (MM) of the solute.
  3. Next, determine the density (D) of the solution.
  4. Finally, calculate the percentage concentration using the formula P = (M * MM * 100) / D.
  5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Molarity (M) = 2 mol/L

Molar Mass (MM) = 58.44 g/mol

Density (D) = 1200 g/L (1.2 g/mL). The mass percentage is 2 × 58.44 × 100 ÷ 1200 = 9.74% w/w; the weight/volume concentration is 11.688% w/v.