1.

Calculate the tmperature at which a solution containing 54 g glucose (C_(6)H_(12)O_(6)) in 80 g of water will freeze (K_(f)for water=1.86 Kmol^(-1)kg).

Answer»


Solution :`W_(B)=54 g, M_(B)=180" g MOL"^(-1), W_(A)=250 g=0.25 kg`
`"No. of MOLES of glucose"(n_(B))=W_(B)/M_(B)=((54G))/((180"g mol"^(-1)))=0.3mol`
`"Molarity of glucose solution (m)"=n_(B)/w_(B)=(0.3mol)/(0.25kg)=1.2" mol kg"^(-1).`
`DeltaT_(f)=K_(f)xxm=(1.86" K kg mol"^(-1))=2.23 K`.
`"Freezing point of solution"=(273.0-2.23)K=270.77 K`


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