Question

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

Answer 1

Correct Answer - D
`DeltaT_(f)=2.8" Let moles of" "C"_(6)H_(6)O_(2)=x`
`2.8=1.86xx(x)/(1)`
`x=1.50`
Mass of `C_(6)H_(6)O_(6)=1.5xx62=93g`