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Nazir Lal Ratti
Asked: 2022-11-03T20:21:17+05:30 In:

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]`
A. `lt10.75g`
B. `gt494.5g`
C. `lt20g`
D. `494.5g`

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]`
A. `lt10.75g`
B. `gt494.5g`
C. `lt20g`
D. `494.5g`
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1 Answer

  1. Correct Answer – B
    `(C)/(5)=(F-32)/(9)`
    `-4^(@)F=-20^(@)CrArrDeltaT_(f)=20^(@)C`
    `”From “DeltaT_(f)=K_(f).mrArrm=(20)/(1.86)=10.75m`
    `”Mass of “C_(2)H_(5)OH” needed “=10.75xx46=494.5g`
    Solution not to freeze at `-20^(@)C` will require more ethanol than the mass needed to freeze at `-20^(@)C`.

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