A solution containing 10 mole of ethylene glycol dissolved in 1000 g of water (`K_(f) = 1.86 K “molality^(-1)` will freeze at:
A. 273 K
B. 2.544 K
C. 254.4 K
D. 25.44 K
A. 273 K
B. 2.544 K
C. 254.4 K
D. 25.44 K
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Correct Answer – C
`Delta T_(f)= “molality” xx K_(f) = 10 xx 1.86 =18.6`
`Delta T_(f) = T^(@) – T rArr T=0 – 18.6`
`=-18.6^(@) + 273 K = 254.4 K`