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By Expert Faculty of Sri Chaitanya
Question

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 mol1)

Moderate
Solution

ΔΤf=0.2K;m=ΔΤfi*ΔKf=0.22×2=0.05m

For Nacl,1=2  

 =0.03moles of NaCl=0.03×58.5g of NaCl=1.76g of NaCl


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