Coolent used in car radiator is aqueous solution of ethylene glycol. In order to prevent the solution from freezing at `- 0.3 ^(@)C.` How much ethylene glycol must be added to 5 kg 18. of water ? `(K _(f) =1.86 k kg mol ^(-1))`

Options

A. 50 kg
B. 55 g
C. 45 kg
D. 40 g

Answer

B

Explanation

`Delta T_(f) =0.3^(@)C`
`Delta T_(f) =0.3^(@)C =(K_(f)xxW_(B) xx1000)/( M _(B)xx W_(A))`
`= (1.86xxW_(B) xx1000)/( 62xx500)`
`therefore W _(H)=50g`
The ammmt used should be more than 50 g.