The mass by mass percentage (w/w%) expresses the concentration as the mass of solute per unit mass of solution. To calculate w/w%, follow these steps: Step 1: Measure the mass (weight) of the solute ...

Total Mass = 100g. Step 3: Calculate Percent by Mass. To find the percent by mass, divide the mass of the solute by the total mass and multiply by 100%. Using our example: Percent by Mass = (Mass of ...