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dik: v NaOH = 100ml, M NaOH=5 M, Massa jenis NaOH = 1,10g/ml. dit: Fraksi mol NaOH?
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- Anonymous9 years agoFavorite Answer
mol NaOH = M NaOH x Vol = 5 mol.L^-1 x 100 mL x 10^-3.L.mL^-1 = 0.5 mol
massa 100 mL larutan NaOH 5M = 100 mL x 1,10 g.mL^-1 = 110 g
dalam 110 g tersebut terdapat 0.5 mol NaOH = 0.5 mol x 40 g.mol^-1= 20 g
Jadi, massa air = 110 g - 20 g = 90 g
mol air = 90 g / 18 g.mol^-1 = 5 mol
jumlah mol total = 5 mol + 0.5 mol = 5.5 mol
Fraksi mol NaOH = 0.5 mol/5.5 mol = 0,091 = 9.1 %
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