After adding non-volatile solute, freezing point of water decreases to-`0.186^(@)C`. Calculate ` DeltaT_(b)"if " K_(f)=1.86 "K kg mol"^(-1) "and" K_(b

Question

After adding non-volatile solute, freezing point of water decreases to-`0.186^(@)C`. Calculate ` DeltaT_(b)"if " K_(f)=1.86 "K kg mol"^(-1) "and" K_(b

After adding non-volatile solute, freezing point of water decreases to-`0.186^(@)C`. Calculate ` DeltaT_(b)"if " K_(f)=1.86 "K kg mol"^(-1) "and" K_(b)=0.521"K kg " mol^(-1)`.
A. 0.0521 K
B. 0.0186 K
C. 0.521 K
D. 1.86 K

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - a
`DeltaT_(f)=K_(f)xxm,DeltaT_(b)xx=K_(b)xxm`
`(DeltaT_(f))/(DeltaT_(b))=K_(f)/K_(b)or DeltaT_(b)=(DeltaT_(f)xxK_(b))/(k_(f))`
`DeltaT_(b)=((0.186K)xx0.521K kg mol^(-1))/((186 K kg mol^(-1)))=0.0521 K`

4 views Answered 2023-02-05 15:29