Question

In cold climate, water freezes causing damage to the radiator of the car . Ethylene glycol is used as an antifreeze. The amount of ethylene glycol to be added to 4 kg of water to prevent it from freezing at $-6^{o}C$ ($K_f$ of water = $1.85K{m}^{-1}$)

• A. 804.3 g
• B. half the amount of water
• C. $3/4^{th}$ of the amount of water
• D. none of these

Answer 1

The correct option is A 804.3 g

$\Delta Tf=Kfm$

$m=\frac{W_B}{M_B}\times \frac{1000}{W_A}$

$6=1.85\times \frac{W_B}{62}\times \frac{1000}{4000}$

$W_B=804.3gm$ Ans