An unsaturated solution is made by completely dissolving 20.0 grams of NaNO3 in 100.0 grams of water at 20.0°C. (the gram formula mass=85.0 grams per mole)

Determine the minimum mass of NaNO3 that must be added to this unsaturated solution to make a saturated solution at 20.0°C.

I haven't been taught this yet but i want to get a head start. So, I am reviewing the regent questions from the website.

Thank you very much for the help

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don't understand it