Question

Ethylene glycol is used as an antifreeze in a cold cliamate Mass of ethylene glycol which should be added to `4` kg for water to prevent it from freezing at `-6^(@)C` will be (`K_(f)` for water =`1.86 K kg mol^(-1)` and molar mass of ethylene glycol =`62 g mol^(-1)`)
A. `304.60kg`
B. `804.328g`
C. `204.30g`
D. `400.00g`

Answer 1

Correct Answer - B
`DeltaT_(f) = k_(f) xx m = k_(f) xx (w_(2) xx 1000)/(w_(1) xx M_(2))`
or `6 = (1.86 xx w_(2) xx 1000)/(4000 xx 62) :. W_(2) = 800g`