Mass percent = (mass of component ÷ total mass of mixture) × 100
Identify the mass of the substance you want the percent of
Identify the total mass of the entire mixture or solution
Divide the component mass by the total mass
Multiply the result by 100
Express the answer as a percent
Formula: mass percent = (mass of solute ÷ mass of solution) × 100
Example: if 5 g of solute is in 20 g of solution, mass percent = (5 ÷ 20) × 100 = 25%