Masa roztworu = 135g + 45 = 180g
Stezenie procentowe = 45g * 100% / 180g = 4500 / 180 = 25%
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Masa roztworu = 135g + 45 = 180g
Stezenie procentowe = 45g * 100% / 180g = 4500 / 180 = 25%