Q.

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)

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answer is 1.76.

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Detailed Solution

ΔΤf=0.2 K ;m=ΔΤfi*ΔKf=0.22×2=0.05mFor Nacl,1=2   =0.03moles of NaCl=0.03×58.5g of NaCl=1.76g of NaCl
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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)