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ms = 6,8g
mw = 44,8g-6,8g = 38g
6,8g ----------- 38g
x g ------------- 100g
38*x = 6,8*100
38x = 680 |:38
x = 17¹⁷/₁₉
x ≈ 17,9
rozpuszczalność wynosi 17,9g/100g