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

Options

A. 204.30g
B. 400.00 g
C. 304.60 g
D. 800.00 g

Answer

D

Explanation

`Delta T_(f) xx (1000K_(f) xx W_(2))/(M_(2) xx W_(1))`
`:. 6 = (1000 xx 1.86 xx W_(2))/(4000 xx 62)`
or `W_(2) = 800g`