Ethylene glycol `(HOH_2C-CH_2OH)` is used as an antifreeze for water to be used in car radiators in cold places. How much ethylene glycol should be added to 1 kg of water to prevent it from freezing at `-10^@C`? Molal depression constant of water is 1.86 K kg `mol^(-1)`.

Answer

`333.3g`

Explanation

`w_(B) = (Delta T_(f) xx w_(A) xxM_(B))/(k_(f) xx 1000)`
`Delta T_(f) = 0 - (-10)= 10^(@)`
`therefore " " w_(B) = (10 xx 1 xx 10^(3) xx 62)/(1.86 xx 1000)`
`= 333.3g`