Question

Calculate the amount of ice that will separate out on cooling containing `50 g `of ethylene glycol in `200 g` of water to `-9.3^(@)C (K_(f)` for water =`1.86 K mol^(-1) kg`)
A. (a) `38.71 g`
B. (b) `38.71 mg`
C. (c ) `42 g`
D. (d) `42 mg`

Answer 1

Correct Answer - A
`:. Delta T = (1000 xx K_(f) xx w)/(m xx W)`
`9.3 = (1000 xx 1.86 xx 50)/(62 xx W)`
`:. W = 161.29`
`:.` Ice separated `= 200-161.29 = 38.71 g`