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  4. How much amount of NaCl should be added to 600 g of water (ρ = 1.00 g/mL) to decrease the freezing point of water to — 0.2°C ? . (The freezing point depression constant for water = 2 K kg mol-1) Given --

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Q. How much amount of NaCl should be added to 600 g of water ($\rho$ = 1.00 g/mL) to decrease the freezing point of water to — 0.2$^{\circ}$C ? ____________________ . (The freezing point depression constant for water = 2 K kg mol$^{-1}$)
Given --

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Solution:

$\Delta T_{f}=i\times m\times K_{f}$
$0.2=2\times2\times\frac{w/ 58.5}{600/ 1000}$
$w=1.755 \, gm$