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224g ---- 1mol
35g ---- x mol
x = (35g * 1mol) : 224g ≈ 0,156 mol
250cm³ = 0,25dm³
Cm = n / V (liczba moli substancji / objętość roztworu)
Cm = 0,156mol / 0,25dm³
Cm = 0,625 mol/dm³