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How much ethyl alcohol must be added to ...

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

A

lt 20 g

B

lt 10.75 g

C

lt 494.5 g

D

gt 494.5 g

Text Solution

Verified by Experts

The correct Answer is:
D
`-4^@F = -20^@C, " " :. Delta T_f = 20^@C`
`DeltaT_f = k_f.m. rArr m =20/(1.86) = 10.75`
mass of `C_2H_5OH` required
`rArr 10.75 xx 46 rArr 494.5 g`
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