Home
Class 12
CHEMISTRY
How many ethyl alcohol must be added to ...

How many ethyl alcohol must be added to `1.00 L` of water so that the solution will not freeze at `-4^(@)F` ?

Text Solution

Verified by Experts

Using relation
`(DeltaT_(f))=K_(f)m`
where `(DeltaT_(f))=-4^(@)F`
or `-4^(@)F=-20^(@)C` `[.^(@)C=(5)/(9)(.^(@)F-32)]`
`:. m=DeltaT_(f)/K_(f)=20/1.86=10.7`
Therefore, amount of ethyl alcohol to be added
`= m xx` molrcular weight
`=10.7xx46.0`
`=495 g`
Promotional Banner

Topper's Solved these Questions

  • SOLUTIONS

    CENGAGE CHEMISTRY|Exercise Solved Examples|40 Videos

  • SOLUTIONS

    CENGAGE CHEMISTRY|Exercise Exercises (Linked Comprehension)|58 Videos

  • SOLID STATE

    CENGAGE CHEMISTRY|Exercise Ex 1.2 (Objective)|9 Videos

  • SURFACE CHEMISTRY

    CENGAGE CHEMISTRY|Exercise Archives Subjective|2 Videos

Similar Questions

Explore conceptually related problems

How much ethyl alcohol must be added to 1 litre of water so that the solution will freeze at - 14^@C ? (Kf for water = 1.86^@C /mol)

The weight of ethyl alcohol which must be added to 1.0 L of water so that the solution will freeze at 14^@F is (K_f of water = 1.86 K kg mol^(-1) )

How much C_(2)H_(5)OH must be added to 1.0"L of "H_(2)O , so that solution should not freeze at -4^(@)F ? [K_(f)(C_(2)H_(5)OH)=1.86^(@)C//m]

How many grams of KCI should be added to 1000 g of water , so that the freezing point reduces to - 10^(@)C? (K_(f) "for water "=1.86""^(@)C kg mol ^(-1))