By dissolving 5g substance in 50g of water, the decrease in freezing point is 1.2 degree celcius. The gram molal depression is 1.85 degree celcius. The molecular weight of substance is
(a)105.4
(b)118.2
(c)137.2
(d)154.2
Asked by Balbir
28th July 2019,
6:08 PM
Answered by Expert
Answer:
Option (d) is correct.
Given:
ΔTf = 1.2 ºC
Wsolvent = 50 gm
Wsolute = 5 gm
Kf = 1.85 ºC gm/mol
Using the formula od depression in freezing point, molecular weight of the subastance can be calculated as,
Molecular weight of the subastance is 154.2 g/mol
Answered by Expert
29th July 2019,
9:51 AM
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