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Δ Tf : 1,86°°C
Kf : 1,86
karena larutan elektrolit,jadi α = 1
tanya : n ?
jawab : Δ Tf = i.m.Kf
1,86 = (1+(n-1) 1 )× 0,2 × 1,86
1,86 = n × 0,372
n = 5