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2)
*diketahui
Po= 20 mmHg
Xpelarut= 0,4
*ditanya
P=...?
*jawab
P= Xpelarut . Po
P= 0,4 . 20
P= 8,0 mmHg (B)
3) D. K dan N
4)
*diketahui
ΔTf= 0,372°C
Kb= 0,52°C/m Kf= 1,86°C/m
*ditanya
ΔTb=...?
*jawab
ΔTf= Kf . m
0,372= 1,86 . m
m= 0,372/1,86
m= 0,2
ΔTb= Kb . m
ΔTb= 0,52 . 0,2
ΔTb= 0,104 (D)
5)
*diketahui
g= 18 gr
Mr= 180
p= 100 gr
Kf= 1,86°C/m
*ditanya
Tf=...?
*jawab
ΔTf= Kf . m
ΔTf= Kf . (gr/Mr . 1000/p)
ΔTf= 1,86 (18/180 . 1000.100)
ΔTf= 1,86 . 1
ΔTf= 1,86
Titik beku= titik beku air - ΔTf
= 0 - 1,86
= -1,86 (E)