MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistrySolutionsDepression in freezing point
Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at – 6ºC will be (Kf for water = 1.86 K kg mol–1. and molar mass of ethylene glycol = 62 g mol–1)
A.800 g✓ Correct
B.204.30 g
C.400.00 g
D.304.60 g
Explanation
According to the equation, 0 ( 6) 1.86 6 1.86 f f T K m m m Hence, mass of ethylene glycol required 6 4 62 800 1.86 g xx