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. 400.00 g
B. 304.60g
C. 804.32g
D. 204.30g

Answer

C

Explanation

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