`K_(f)` for water is `1.86 K kg mol^(-1)`. IF your automobile radiator holds `1.0 kg` of water, how many grams of ethylene glycol `(C_(2)H_(6)O_(2))` must you add to get the freezing point of the solution lowered to `-2.8^(@)C` ?

Options

A. 27 g
B. 72 g
C. 93 g
D. 39 g

Answer

C

Explanation

`Delta T_(f) = (1000K_(f) xx W_(2))/(M_(2) xx W_(1))`
`:. 2.8 = (1000 xx 1.86 xx W_(2))/(1000 xx 62) or W_(2) = 93g.`