Question

find the percentage of concentration when 5gm of salt is added to 50gm of water​

Answer 1

Answer:

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,

 

straight M subscript 2 space equals space fraction numerator straight K subscript straight f cross times straight W subscript solute cross times 1000 over denominator increment straight T subscript straight f space cross times space straight W subscript solvent end fraction

space space space space space space equals fraction numerator 1.85 cross times 5 cross times 1000 over denominator 1.2 cross times 50 end fraction

straight M subscript 2 space equals space 154.166

straight M subscript 2 space almost equal to space 154.2 space straight g divided by mol

 

Molecular weight of the subastance is 154.2 g/mol

Explanation:

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