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  4. Ethylene glycol is used as antifreeze to reduce freezing point of water to -2.4° C. What mass of antifreeze is required for 2 L water? (Kf water = 1.86 K kg/mole)

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Q. Ethylene glycol is used as antifreeze to reduce freezing point of water to $-2.4^{\circ}\,C$. What mass of antifreeze is required for $2\, L$ water? $(K_f \,water\, = \,1.86\, K \,kg/mole)$

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Solution:

$w_{solute}=\frac{\Delta T _{f} \times w_{water}\times M_{solute}}{K _{f}}$
$\quad\quad=\frac{2.4\times2\times0.062}{1.86}=160 g$
$\quad\quad\quad\quad$ [Mass of 2 L of water is 2 kg.]