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∆Tf = m × Kf
15,6 = m × 40
m = 0,39
mol naftalena = m × massa kamper (kg)
mol naftalena = 0,39 × 0,003 kg
mol naftalena = 1,17 × 10^-3
Mr naftalena = massa naftalena / mol
Mr naftalena = 0,15 / (1,17 × 10^-3)
Mr naftalena = 128,2 atau dibulatkan menjadi 128