Mass Percent: 20 g Solute in 200 g Solution
20 grams of solute in 200 grams of solution equals a mass percent of 10% (w/w).
How to use this tool
- Enter mass of solute and mass of solution in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your mass percent (w/w) and the full breakdown beneath it.
This common lab scenario — 20 g in 200 g — yields a 10% mass-percent solution.
Frequently asked questions
- How is w/w% different from w/v%?
- w/w% uses mass of solution in the denominator; w/v% uses volume (mL). For dilute aqueous solutions (density ≈ 1 g/mL) they are approximately equal, but they diverge at high concentrations.
- Why use mass instead of volume?
- Mass is independent of temperature and pressure, making w/w% more reproducible for concentrated or non-aqueous solutions.