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aTf = 4°C, maka ΔTf = titik beku benzene - ΔTf
ΔTf = 5,5 - 4 = 1,5°C
ΔTf = [massa alcohol/Mr] x [1000/massa benzena] x Kf
1,5 = [6/Mr] x [1000/massa benzena] x 5
Mr = [6 x 1000 x 5] / [1,5 x massa benzena]
Mr lauril alcohol = 20000/massa benzena
setelah ada informasi massa pelarut benzena tentu Mr lauril alcohol dapat diperoleh